Lenk, J.
This case concerns the jurisdiction of the Juvenile Court.1 The Commonwealth filed five delinquency complaints against the defendant when he was seventeen, charging him with rape of a child under sixteen, G. L. c. 265, § 23, and indecent assault and battery on a child under fourteen, G. L. c. 265, § 13B, based on an alleged seven-year period of sexual abuse of the victim. Although summonsed into court on those complaints while still seventeen years old, the defendant had turned eighteen by the time of his first scheduled court appearance and arraignment. More than six months later, the Commonwealth obtained youthful offender indictments against the defendant, based on the portion of the alleged abuse that took place when he was between fourteen and seventeen years old.
Pursuant to Mass. R. Crim. P. 34, as amended, 442 Mass. 1501 (2004), a judge of the Juvenile Court reported four questions concerning issues of the Juvenile Court’s jurisdiction:
“1. Whether the term ‘apprehended’ as appearing in G. L. c. 119, § 72[,] and G. L. c. 119, § 72A[,] refers to the time when a complaint is issued against an individual, or to when an individual is summoned for arraignment, or when an individual voluntarily appears in response to a summons or complaint and submits to the jurisdiction of the court at arraignment, or when an individual is arrested, or taken into custody pursuant to a complaint issued by the court?
“2. Whether an individual may be indicted as a youthful offender after he has turned 18, for offenses he allegedly committed between the ages of 14 and 17?
“3. If yes to question 2, would those youthful offender indictments be subject to a hearing pursuant to G. L. c. 119, § 72A[,] or would the individual be proceeded against as a youthful offender pursuant to G. L. c. 119, §§ 54 and 58?
[629]*629“4. If no to question 2, may the court permit such an indictment to proceed if a delinquency complaint on the same facts against the [defendant was filed timely before his eighteenth birthday?”
We conclude that the commencement of process marks the point of apprehension, provided the individual is available to the court at that time. We answer the second reported question in the negative and, therefore, proceed directly to the fourth reported question. In answer to that question, we conclude that a youthful offender indictment may not issue against an individual after his or her eighteenth birthday, regardless of whether a delinquency complaint on the same facts has been filed before the individual’s eighteenth birthday.
1. Background and prior proceedings. On May 10, 2011, the State police filed an application for a delinquency complaint in the Juvenile Court against the defendant, after initially being notified of allegations of sexual abuse on December 13, 2010. The application for the complaint alleged two counts of rape of a child under sixteen, G. L. c. 265, § 23, and three counts of indecent assault and battery on a child under fourteen, G. L. c. 265, § 13B. An assistant clerk-magistrate allowed the application on the day that it was filed, resulting in the issuance of five delinquency complaints against the defendant. The basis of the complaints was the defendant’s alleged sexual abuse of the victim over a seven-year period, from August, 2001, to December, 2008, when the defendant was between eight and fifteen years old. On May 11, 2011, a summons issued, ordering the defendant and his mother to appear in the Juvenile Court on May 31. On May 31, the defendant duly appeared and was arraigned; he was released on personal recognizance, with conditions. When the complaint and summons issued, the defendant was less than two weeks shy of his eighteenth birthday. By the time of his arraignment on May 31, the defendant had turned eighteen years old.
Six months later, while the delinquency complaints were pending in the Juvenile Court, the Commonwealth pursued youthful offender indictments against the defendant pursuant to G. L. c. 119, § 54; the Commonwealth previously had assented [630]*630to the defendant’s motion to confirm Juvenile Court jurisdiction and had agreed not to pursue a transfer hearing. On December 5, 2011, a grand jury returned youthful offender indictments charging two counts of rape of a child under sixteen and three counts of indecent assault and battery on a child under fourteen. The indictments allege that the offenses occurred between May 23, 2007, and December 31, 2008, when the defendant was between fourteen and fifteen years old. Due to alleged violations of the release conditions, the Commonwealth moved to revoke bail, and on December 7, 2011, a warrant issued for the defendant’s arrest. The defendant was taken into custody on this warrant on December 13, when he appeared at a pretrial conference. Also on December 13, the defendant was arraigned on the youthful offender indictments, and the Commonwealth entered nolle prosequi on four of the five delinquency complaints. A nolle prosequi was entered on the remaining complaint on June 18, 2012, after the defendant had attained the age of nineteen.
On February 2, 2012, the defendant filed a motion to dismiss the indictments, arguing, inter alia, that the Juvenile Court lacked jurisdiction to proceed under G. L. c. 119, § 72, since the youthful offender indictments issued after his eighteenth birthday. That motion was denied; the defendant’s subsequent motion to report questions of law was allowed. After a Juvenile Court judge reported four questions to the Appeals Court, we transferred the case to this court on our own motion.
2. Statutory framework. After this case was argued, the Governor signed St. 2013, c. 84, “An Act expanding juvenile jurisdiction,” which amended various provisions of G. L. c. 119. The act confers jurisdiction on the Juvenile Court over cases where the alleged offense was committed up to the point of a defendant’s eighteenth (rather than seventeenth) birthday. We analyze this case, however, under the statutory scheme as it existed at all relevant times prior to this amendment.
In general, the Juvenile Court has jurisdiction over children between the ages of seven and seventeen who are alleged to have committed an offense (other than murder) prior to their [631]*631seventeenth birthday.2 G. L. c. 119, §§ 52, 74. The Juvenile Court also retains jurisdiction over children who turn eighteen while their cases are pending, in order to adjudicate “all remands and retrials following appeals from their cases, or during continuances or probation, or after their cases have been placed on file, or for any other proceeding arising out of their cases.” G. L. c. 119, § 72 (a) (where proceeding commenced via delinquency complaint). G. L. c. 119, § 72 (b) (where proceeding commenced via youthful offender indictment). The Commonwealth may proceed against these children along one of two tracks, each with different procedural protections and sentencing consequences for the juvenile.
First, “if the juvenile is proceeded against by complaint, the juvenile is classified as a delinquent.” Commonwealth v. Dale D., 431 Mass. 757, 759 (2000). Individuals proceeded against as delinquents are afforded protections not available in the adult system, such as the presumptive privacy of court records, G. L. c. 119, § 60A, and pre- or postadjudicatory probation, G. L. c. 119, § 58. Perhaps most importantly, Juvenile Court judges have broad “discretion ... to render individualized dispositions consistent with the best interests of the child,” Commonwealth v. Hanson H., 464 Mass. 807, 808 (2013), by either “placing] the case on file or . . . placing] the child in the care of a probation officer for such time and on such conditions as it deems appropriate or . . . commit[ting] him to the custody of the department of youth services.” G. L. c. 119, § 58.
Alternatively, the Commonwealth may seek an indictment against a juvenile for specific types of violent offenses or where the individual previously has been adjudicated delinquent and was between the ages of fourteen and seventeen at the time of the offense;3 “ [i]f an indictment is successfully obtained, the [632]*632juvenile is classified as a youthful offender.” Commonwealth v. Dale D., supra at 759. See G. L. c. 119, § 54. The youthful offender designation, legislatively created in 1996 in “response to societal concerns about violent crimes committed by juveniles,” Commonwealth v. Clint C., 430 Mass. 219, 222-223 (1999), was intended “to reduce or eliminate certain protections previously available to all juvenile offenders.” Doe v. Attorney Gen. (No. 1), 425 Mass. 210, 212-213 (1997). Although youthful offenders are proceeded against in Juvenile Court, their treatment may, in other respects, resemble that of adult offenders: their court proceedings are not shielded from public inspection; they are eligible for enhanced penalties, including any adult sentence provided for by law; and they can be confined in an adult house of correction or State prison. G. L. c. 119, § 58. Thus, the terms “youthful offender” and “delinquent child” reflect and incorporate different legislative judgments about the accountability of children for certain offenses.
While proceedings under either a delinquency complaint or a youthful offender indictment presuppose that an individual is under the age of eighteen when the proceeding is commenced, the Commonwealth is not precluded from prosecuting individuals who are “apprehended” after their eighteenth birthdays for offenses committed prior to turning seventeen.4 See G. L. c. 119, § 72A. In such cases, the Commonwealth first must file a delinquency complaint and obtain a transfer hearing in the Juvenile Court. Id. Commonwealth v. Nanny, 462 Mass. 798, 802 (2012). At the transfer hearing, a Juvenile Court judge considers whether there is probable cause to believe that the individual committed the charged offense and, if so, whether the individual should be discharged or whether the public interest requires that the case be transferred and the individual be tried as an adult. G. L. c. 119, § 72A.
3. Discussion, a. First reported question. The first reported question is:
“Whether the term ‘apprehended’ as appearing in G. L. [633]*633c. 119, § 72[,] and G. L. c. 119, § 72A[J refers to the time when a complaint is issued against an individual, or to when an individual is summonsed for arraignment, or when an individual voluntarily appears in response to a summons or complaint and submits to the jurisdiction of the court at arraignment, or when an individual is arrested, or taken into custody pursuant to a complaint issued by the court?”
The word “apprehended” in this context is, as yet, undefined in our case law, but of central importance in determining the jurisdiction of the Juvenile Court. As discussed supra, an individual’s age at apprehension dictates whether the Juvenile Court has jurisdiction to proceed: persons apprehended prior to their eighteenth birthdays will be proceeded against as children, and persons apprehended after their eighteenth birthdays will either be proceeded against as adults or discharged. G. L. c. 119, §§ 72, 72A.
Here, if apprehension is fixed at the time of the issuance of either the complaint or the summons, the defendant was apprehended on the complaints when he was seventeen, and should be prosecuted in the Juvenile Court. However, if we deem apprehension to have occurred no earlier than the time of arraignment or of having been taken into custody, the defendant was apprehended on the complaints at age eighteen, and the Commonwealth should proceed by means of a transfer hearing pursuant to G. L. c. 119, § 72A.
As with all matters of statutory interpretation, we look first to the plain meaning of the statutory language. See International Fid. Ins. Co. v. Wilson, 387 Mass. 841, 853 (1983), citing Hoffman v. Howmedica, Inc., 373 Mass. 32, 37 (1977) (“the primary source of insight into the intent of the Legislature is the language of the statute”). Where the language is clear and unambiguous, it is to be given its “ordinary meaning.” Commonwealth v. Brown, 431 Mass. 772, 775, (2000), citing Victor V. v. Commonwealth, 423 Mass. 793, 794 (1996). “Of course, this meaning must be reasonable and supported by the purpose and history of the statute.” Wright v. Collector & Treas. of Arlington, 422 Mass. 455, 457-458 (1996), citing Sterilite Corp. v. Continental Cas. Co., 397 Mass. 837, 839 (1986).
[634]*634In criminal cases generally, the word “apprehend” ordinarily is used to indicate a physical arrest. See, e.g., Commonwealth v. Forde, 367 Mass. 798, 807 (1975) (“Factors which would have tended to support a finding of exigency include ... a likelihood that the suspect would escape if not apprehended” [emphasis supplied]); Commonwealth v. Grant, 57 Mass. App. Ct. 334, 338 (2003) (“this was a deliberate emergency police effort to apprehend one or more fleeing suspects” [emphasis supplied]). Recognizing the salient differences between the adult and juvenile criminal justice systems, however, both the defendant and the Commonwealth urge that the point of apprehension in juvenile cases should be fixed not when an individual is physically taken into custody but, rather, at the time of commencement of process, provided that the juvenile is available to the court at that point. We agree.
We begin by noting that this definition of apprehension is especially appropriate in the juvenile justice context. Focusing on physically taking an individual into custody is inapt in the juvenile setting, given that the statute discourages the use of arrest warrants and instead directs courts to issue summonses in the vast majority of cases. See G. L. c. 119, § 54 (only summons may be used where juvenile is under age twelve; in all other cases, summons shall issue instead of warrant, unless court has reason to believe that defendant will not appear upon summons). Furthermore, the juvenile system, as a whole, is predicated on the theory that proceedings against juveniles are “non-criminal and treatment-oriented.” R.L. Ireland, Juvenile Law § 1.3 (2d ed. 2006). Fixing the time of apprehension earlier rather than later increases the likelihood that individuals will be proceeded against prior to their eighteenth birthdays, thereby keeping them in this rehabilitative system.
Defining “apprehension” for the purposes of G. L. c. 119, §§72 and 72A, to mean the point of issuance of process, in this case a summons, also comports with the dictionary definition of the word, as well as with the statutory scheme as a whole. Black’s Law Dictionary 117, 1480 (9th ed. 2009) defines “apprehension” as “[s]eizure in the name of the law; arrest,” while “seizure” is defined as “[t]he act or an instance of taking possession of a person or property by legal right or pro[635]*635cess . . . .” Rule 6 (a) of the Massachusetts Rules of Criminal Procedure, 378 Mass. 852 (1979), provides that process can issue either by a summons or a warrant; the filing of a complaint alone does not cause process to issue. As stated, a summons is the preferred method of issuing process in the juvenile system. See G. L. c. 119, § 54. Rule 6 (a) explains that a summons notifies an individual of the criminal proceedings against him or her and the date that he or she is to appear in court. Therefore, the issuance of a summons “apprehends” an individual by commencing process against him or her and serving as a notification of the pending charges.
Such a construction comports with the statutory scheme. Both G. L. c. 119, § 72 (a) and (b), provide that “the divisions of the juvenile court department shall continue to have jurisdiction over children who attain their eighteenth birthday pending final adjudication of their cases.” Since the statute specifies that the Juvenile Court is to retain jurisdiction in such cases, apprehension cannot depend on being taken into custody. If it did, a case could be commenced against an individual in Juvenile Court while he or she was still seventeen and he or she could then be taken into custody after turning eighteen, at which point G. L. c. 119, § 72A, would divest the Juvenile Court of jurisdiction and mandate a transfer hearing. The better construction is to conclude that apprehension occurs upon commencement of process, provided the juvenile is available to the court. This view allows the Juvenile Court to retain jurisdiction in cases where a defendant turns eighteen after the proceeding has commenced, G. L. c. 119, § 72 (a) and (b), and, in so doing, prevents those statutory sections from being rendered superfluous.5 See [636]*636Commonwealth v. Nanny, supra at 804, quoting Wolfe v. Gormally, 440 Mass. 699, 704 (2004) (“A basic tenet of statutory construction [is] that a statute [must] ‘be construed “so that effect is given to all its provisions, so that no part will be inoperative or superfluous” ’ ”). See also Commonwealth v. Sullivan, 78 Mass. App. Ct. 631, 633 n.1 (2011) (“we may assume without deciding that commencement of process and availability to the court would also amount to ‘apprehension’ ”).
By limiting this definition of “apprehension” to circumstances in which a juvenile is “available” to the court, we refer to those situations where there is no “reason to believe that he will not appear upon summons.” G. L. c. 119, § 54. However, if there is cause to believe that the juvenile will not appear on the summons, “or if such a child has been summoned and did not appear,” G. L. c. 119, § 54, provides that a warrant instead may issue for the juvenile’s arrest. Where a warrant issues, apprehension occurs when a juvenile “is taken into custody and available to the Juvenile Court for disposition of the case against him.” Commonwealth v. A Juvenile, 16 Mass. App. Ct. 251, 257 (1983). It is only when the juvenile is physically taken into custody that the authorities will have notified the juvenile of the proceedings against him or her, and also ensured that he or she will submit to the jurisdiction of the court.6 See Mass. R. Crim. P. 6 (c) (3), 378 Mass. 852 (1979).
b. Second reported question. The second reported question is: “Whether an individual may be indicted as a youthful offender after he has turned 18, for offenses he allegedly committed between the ages of 14 and 17?”
When the Juvenile Court judge reported this question, Commonwealth v. Nanny, 462 Mass. 798 (2012), was pending before us. That case presented the same question whether the Commonwealth could proceed directly on a youthful offender indictment against an individual over the age of eighteen, for offenses [637]*637allegedly committed when he was between the ages of fourteen and seventeen,7 or whether the individual was first entitled to a transfer hearing under G. L. c. 119, § 72A. We concluded that, in those circumstances, the Commonwealth could not proceed with a youthful offender indictment, and that the appropriate way to proceed against such individuals is by filing a delinquency complaint and then seeking a transfer hearing pursuant to G. L. c. 119, § 72A. See Commonwealth v. Nanny, supra at 806.
We determined that the plain language of G. L. c. 119, § 72A, requires that all defendants who meet the two statutory predicates (commission of offense prior to seventeenth birthday and apprehension after eighteenth birthday) be afforded transfer hearings. Id. at 802. We also emphasized that transfer hearings afford greater procedural protections than grand jury proceedings. Id. at 805.
Therefore, we answer the second reported question in the negative, in accordance with our decision in Commonwealth v. Nanny, supra. Because of our answer to the second reported question, we do not answer the third reported question.
c. Fourth reported question. The fourth reported question is: “If no to question 2, may the court permit such an indictment to proceed if a delinquency complaint on the same facts against the [djefendant was filed timely before his eighteenth birthday?” In essence, we are asked to decide whether the existence of a timely filed delinquency complaint changes the outcome of Commonwealth v. Nanny, supra. We hold that it does not.
A different result could be justified only if a youthful offender indictment qualifies, as the Commonwealth urges, as “any other proceeding arising out of” a case initiated by delinquency complaint, such that the Juvenile Court may retain jurisdiction over it pursuant to G. L. c. 119, § 72 (a) (“The divisions of the juvenile court department shall continue to have jurisdiction over children who attain their eighteenth birthday pending final adjudication of their cases, including all remands [638]*638and retrials following appeals from their cases, or during continuances or probation, or after their cases have been placed on file, or for any other proceeding arising out of their cases”).
If a youthful offender indictment constitutes “any other proceeding arising out of” a case initiated by delinquency complaint, so long as a complaint was timely filed before an individual’s eighteenth birthday, a youthful offender indictment, at least on the same facts, could later issue against that person at any point after his or her eighteenth birthday. The individual would then remain subject to the jurisdiction of the Juvenile Court and there would be no need for a transfer hearing pursuant to G. L. c. 119, § 72A. Relating apprehension on the youthful offender indictment back to the time of apprehension on the complaint is necessary, the Commonwealth maintains, to avoid needless pressure to complete the indictment process prior to an individual’s eighteenth birthday.
On the other hand, if a youthful offender indictment is not “any other proceeding arising out of” a case initiated by a delinquency complaint, the Commonwealth may proceed in such circumstances only by the filing of a delinquency complaint, followed by a transfer hearing pursuant to G. L. c. 119, § 72A. The defendant argues that this result is compelled by the statutory scheme, which treats delinquency complaints and youthful offender indictments as distinct charging mechanisms, and that no provision extends Juvenile Court jurisdiction over youthful offender indictments brought after an individual has turned eighteen. Furthermore, the defendant maintains, the complaints and the indictments here were treated as separate criminal proceedings, based on different factual allegations.
In determining whether a youthful offender indictment qualifies as “any other proceeding arising out of” a case initiated by complaint, we consider the text of G. L. c. 119, § 72 (a), and the statutory scheme more generally, paying particular attention to the role of the G. L. c. 119, § 72A, transfer hearing.
To discern the meaning of “any other proceeding,” we turn first to the text of G. L. c. 119, § 72 (a). That provision states that the Juvenile Court is to retain jurisdiction over individuals “who attain their eighteenth birthday pending final adjudication of their cases, including all remands and retrials following ap[639]*639peals from their cases, or during continuances or probation, or after their cases have been placed on file, or for any other proceeding arising out of their cases.” In interpreting the words “any other proceeding” in this sentence, we are guided by the ejusdem generis canon of statutory construction, which provides that “specific words . . . identify the class and [restrict] the meaning of general words to things within the class.” Commonwealth v. Zubiel, 456 Mass. 27, 31 (2010), quoting 2A N.J. Singer & J.D. Shambie Singer, Sutherland Statutory Construction § 47.17, at 379 (7th ed. 2007). “The doctrine is most appropriate when a series of several terms is listed that concludes with the disputed language.” Banushi v. Dorfman, 438 Mass. 242, 244 (2002), citing Perlera v. Vining Disposal Serv., Inc., 47 Mass. App. Ct. 491, 496 n.8 (1999).
Here, every example of proceedings “arising out of their cases” in the statutory list is a procedural step in determining and administering the consequences stemming from an existing complaint. The general words “any other proceeding” are qualified by the more specific words preceding them; a new indictment that substantially increases a defendant’s sentencing exposure is qualitatively different from a continuation of an existing complaint in the form of a remand or retrial, and is thus not contemplated by the phrase “any other proceeding.”
Moreover, because “[d]ouble jeopardy prohibits prosecuting or punishing a defendant twice for the same offense,” Solomon v. Commonwealth, 453 Mass. 1020, 1021 (2009), citing Commonwealth v. Rabb, 431 Mass. 123, 127 (2000), and given that jeopardy attaches at a juvenile proceeding when the trier of fact begins to hear evidence, Breed v. Jones, 421 U.S. 519, 531 (1975), a complaint and an indictment for the same offense cannot both proceed to final dispositions simultaneously. Therefore, in practice, a nolle prosequi is often entered on a complaint, or the complaint is dismissed by the court after an indictment issues. See, e.g., Commonwealth v. Washington W., 462 Mass. 204, 206 (2012) (Commonwealth indicted juvenile as youthful offender for same two incidents of rape alleged in two delinquency complaints, and entered nolle prosequi on delinquency complaints). When this happens, the existing complaint is extinguished, and the indictment opens a new case. An indict[640]*640ment thus often results in the demise of a complaint, and one cannot be said to arise out of the other and prolong the case in the same way that remands or retrials do.
The Legislature’s failure to include youthful offender indictments in G. L. c. 119, § 72 (a), as a type of proceeding arising out of a case initiated by complaint, is all the more noteworthy given that it created a separate provision, G. L. c. 119, § 72 (b), to confer a discrete grant of jurisdiction upon the Juvenile Court “[i]f the commonwealth has proceeded by indictment” prior to a defendant’s eighteenth birthday. This distinct subsection reinforces the inference that complaints and indictments are alternative methods of initiating proceedings, each resulting in distinct “cases,” rather than one type of proceeding that derives from another.8
Finally, we note that G. L. c. 119, § 53, directing courts to construe liberally certain provisions relating to the juvenile justice system, does not supply a basis for reaching an alternative conclusion. That section states, “Sections fifty-two to sixty-three, inclusive, shall be liberally construed so that the care, custody and discipline of the children brought before the court shall approximate as nearly as possible that which they should receive from their parents, and that, as far as practicable, they shall be treated, not as criminals, but as children in need of aid, encouragement and guidance.” G. L. c. 119, § 53. The dissent relies on this policy of liberal construction to arrive at a result other than that suggested by the plain text of the statute, post at 650-651, but this reliance is misplaced, for the provision we are construing is not G. L. c. 119, § 54, governing youthful offender indictments, but G. L. c. 119, § 72 (a), relating to continuing jurisdiction. In prior cases, we have noted the Legislature’s explicit exclusion of certain provisions from the ambit of G. L. c. 119, § 53, and, accordingly, have adhered to the plain [641]*641text of the statute. See Commonwealth v. Forges, 460 Mass. 525, 530 (2011) (interpreting G. L. c. 119, § 72A, and stating, “In enacting the new § 72A in 1996, the Legislature no longer required that the case ‘shall be heard and determined in accordance with [G. L. c. 119, §§ 53-63],’ where an offense is committed before a person’s seventeenth birthday but the person is not apprehended until after his eighteenth birthday. Therefore, we need not look to G. L. c. 119, §§ 53-63, to determine whether any of these statutes provide for the transfer of a delinquency complaint to an adult criminal court”).
Next, we consider the statutory scheme beyond the text of G. L. c. 119, § 72 {a). “[W]e look to the language of the entire statute, not just a single sentence, and attempt to interpret all of its terms ‘harmoniously to effectuate the intent of the Legislature.’ ” Commonwealth v. Hanson H., 464 Mass. 807, 810 (2013), quoting Commonwealth v. Raposo, 453 Mass. 739, 743 (2009). In so doing, we are mindful of the Legislature’s “twin goals” with respect to the juvenile justice system, namely, “protecting the public from dangerous offenders, while emphasizing the rehabilitation of those children who pose a less serious risk to society.” Commonwealth v. Connor C., 432 Mass. 635, 646 (2000).
These twin goals are borne out by the existence of dual tracks within the juvenile justice system, with varying attendant rights and protections; complaints against individuals label them “delinquents” and place them on one track, while indictments label their subjects “youthful offenders” and place them on another. See Commonwealth v. Dale D., 431 Mass. 757, 759 (2000). “A ‘delinquent child’ is subject to essentially rehabilitative penalties and remedies, while a ‘youthful offender’ is subject to penalties ranging from placement in a [Department of Youth Services] facility to adult sentences in the State prison.” Commonwealth v. Connor C., supra at 645.
The statute reflects these two legislative aims and, through its use of disjunctive language in many places, evinces an intent that a case proceed along one of these tracks, rather than straddle the line between the two. See G. L. c. 119, § 54 (“The commonwealth may proceed by complaint... or by indictment. . . . The court shall proceed on the complaint or the [642]*642indictment, as the case may be, in accordance with sections fifty-five to seventy-two, inclusive” [emphases supplied]); G. L. c. 119, § 55B (discussing pretrial motions in “a delinquency case or case in which the commonwealth has proceeded by indictment” [emphasis supplied]); G. L. c. 119, § 72 (a) (continued jurisdiction for cases timely initiated by complaint); G. L. c. 119, § 72 (b) (continued jurisdiction for cases timely initiated by indictment). Nowhere does the statute suggest that a complaint is merely a placeholder or a stand-in for an indictment to follow at a later date; rather, it gives the Commonwealth discretion to pursue either a complaint or an indictment, with the attendant consequences.
To be sure, the Commonwealth’s use of one charging mechanism does not altogether preclude it from employing another, subject to the foregoing considerations. See Commonwealth v. Dale D., supra at 759-760 (rejecting argument that “once the Commonwealth chooses to attempt to proceed by indictment, its option to proceed by complaint is foreclosed,” where Commonwealth attempted to proceed by delinquency complaint after grand jury returned “no bill” on proposed youthful offender indictments). The Commonwealth is also not prohibited from bringing and maintaining a delinquency complaint while simultaneously seeking to obtain a timely youthful offender indictment from a grand jury. And the indictment sought may be based on the same set of facts as the complaint, or a subset of those facts,9 provided that they do not both pass the point of jeopardy-attachment, resulting in the individual twice being prosecuted for the same offense. See Stokes v. Commonwealth, 368 Mass. 754, 762 (1975) (juvenile delinquency hearing qualifies as adjudicatory proceeding; where trier of fact has begun to hear evidence on merits, juvenile may not be tried for [643]*643second time as adult). Cf. Commonwealth v. Washington W., supra at 206.
In any event, if the Commonwealth obtains a youthful offender indictment while a delinquency complaint is pending, process must issue once again to inform a defendant of the new criminal proceedings, regardless of whether the indictment concerns the same or similar factual allegations as the complaint. See Mass. R. Crim. P. 6 (a). As stated in our discussion of the first reported question, this commencement of process constitutes apprehension; both the Massachusetts Rules of Criminal Procedure and considerations of due process dictate that a defendant be notified of new proceedings pending against him or her.10 Thus, the commencement of process after an indictment marks a new point of apprehension, distinct from any apprehension on delinquency complaints. The statute clearly prescribes that a specific procedure, the transfer hearing pursuant to G. L. c. 119, § 72A, take place when a defendant who is over the age of eighteen is apprehended, and makes no provision that the time of apprehension on an indictment relates back to the time of apprehension on a complaint. See Johnson v. Commonwealth, 409 Mass. 712, 717 (1991) (“Nor may we infer an intent by the Legislature to permit an extension of jurisdiction [in G. L. c. 119, § 72] by resort to the concept of tolling”).
Our prior cases suggesting that a juvenile can be adjudicated a delinquent where the Commonwealth has proceeded by a youthful offender indictment but has failed to prove the additional elements required by G. L. c. 119, § 54, are not to the contrary. In Commonwealth v. Quincy Q., 434 Mass. 859, 864-867 (2001), for example, we characterized youthful offender indictments as “authorizing] judges to increase the punishment for juveniles convicted of certain offenses beyond the statutory maximum otherwise permitted,” such that all facts supporting this enhanced penalty had to be proved to a jury beyond a reasonable doubt pursuant to Apprendi v. New Jersey, 530 U.S. 466 (2000). We held that where “the jury find that the defend[644]*644ant is guilty of the underlying offense but that the requirements of G. L. c. 119, § 54, have not been satisfied,” the underlying offense will be treated as a delinquency complaint and the defendant instead may be adjudicated a delinquent. See Commonwealth v. Quincy Q., supra at 866-867 & n.8. See also Commonwealth v. Lamont L., 438 Mass. 842, 843 (2003) (“when the Commonwealth indicts a juvenile as a youthful offender and improperly joins a companion indictment on a misdemeanor charge against the same juvenile, and, after trial, the juvenile is adjudicated a youthful offender on the misdemeanor charge, the proper remedy is . . .to order the entry of a delinquency finding on that misdemeanor offense”).
According to the dissent, these cases demonstrate that adjudication on a delinquency complaint functions as a lesser included offense of conviction on a youthful offender indictment. Post at 653. To the extent that this is a useful analogy, it is only to show that, as an evidentiary matter, the delinquency complaint is coextensive with the “underlying offense” of a youthful offender indictment. That the Commonwealth can obtain an adjudication of delinquency if it has not succeeded in proving all the elements required for a youthful offender conviction does not also entail that a youthful offender conviction can “arise out of” a delinquency complaint. In other words, a youthful offender indictment can be ratcheted down at trial to a delinquency complaint, but a delinquency complaint cannot be ratcheted up to a youthful offender indictment. In any case, in both Commonwealth v. Quincy Q., supra, and Commonwealth v. Lamont L., supra, the Commonwealth proceeded directly on a youthful offender indictment without ever having filed a delinquency complaint; at no point was there an extant “case” comprising both a youthful offender indictment and a delinquency complaint. Thus, while the parallel to lesser included offenses drawn from these cases is useful for analyzing what the Commonwealth must prove at trial, it has little bearing on whether different charging decisions initiate different cases.
Finally, we turn to the import of the transfer hearing under G. L. c. 119, § 72A, which becomes relevant where a defendant is apprehended after his or her eighteenth birthday. In such cases, the statute mandates that a transfer hearing take place in [645]*645the Juvenile Court, at which time a judge determines whether there is probable cause to believe that the individual committed the charged offense and whether the public interest requires that he or she be tried as an adult, or that charges be dismissed altogether. G. L. c. 119, § 72A. As we stated in Commonwealth v. Nanny, 462 Mass. 798, 805 (2012), “A probable cause determination [in a transfer hearing] differs from that made in grand jury proceedings in many respects including that a judge makes the determination, not a grand jury, and a defendant may present a defense and cross-examine witnesses affording significant due process protections not available before a grand jury.” The greater protections of a transfer hearing afforded one over the age of eighteen are appropriate when the consequences for past conduct may entail prosecution as an adult, a safeguard that is not necessary when an individual is still within the jurisdiction of the Juvenile Court.
The legislative intent that we discerned in Commonwealth v. Nanny, supra, to ensure that an individual over the age of eighteen cannot be proceeded against on a youthful offender indictment after his or her eighteenth birthday, omitting, as it does, the requirement of a transfer hearing, also counsels in favor of a similar result in cases where the Commonwealth already has filed a complaint. That a complaint has been filed timely provides no assurance whatsoever of the ensuing timeframe in which an indictment will issue. Were we to accept the Commonwealth’s construction of the statutory scheme, an individual could be proceeded against as a youthful offender at any point after he or she turned eighteen, so long as he or she had been apprehended on a delinquency complaint prior to that date, obviating the need for the more protective transfer hearing altogether. We reiterate what we said in Commonwealth v. Nanny, supra at 804: “Because such an interpretation . . . would render the language of [G. L. c. 119, § 72A,] superfluous, we reject the Commonwealth’s argument.”
Ultimately, the Juvenile Court is a court of limited jurisdiction, which “has no. . . authority in the absence of a specific statutory authorization.” Commonwealth v. A Juvenile, 406 Mass. 31, 34 (1989). When the Legislature has intended to broaden the scope of this jurisdiction, it has done so expressly, as with the [646]*646most recent amendment that increased the jurisdictional age limit from seventeen to eighteen. See St. 2013, c. 84. We presume that the Legislature enacts legislation with “an awarefness] of the prior state of the law as explicated by the decisions of this court,” Commonwealth v. Callahan, 440 Mass. 436, 441 (2003), quoting L.W.K. v. E.R.C., 432 Mass. 438, 455 (2000) (Cowin, J., dissenting). If the Legislature had disagreed with the result in Commonwealth v. Nanny, supra, and wished to make it easier for youthful offender indictments to issue after an individual otherwise ages out of the juvenile justice system, it would have addressed the matter when it increased by one year the Juvenile Court’s jurisdictional age limit. Indeed, raising that age limit was the method it chose for bringing more people under the aegis of the Juvenile Court, rather than blurring the lines between delinquency complaints and youthful offender indictments.
Therefore, for the reasons discussed, we answer the reported question in the negative and, in so doing, hold that the time of apprehension on a youthful offender indictment does not relate back to the time of apprehension on a delinquency complaint. This answer has a special impact on that narrow set of cases where the Commonwealth wishes to proceed against an individual who is just shy of the Juvenile Court’s jurisdictional age limit. We recognize that, among the consequences that may ensue for this group, the Commonwealth may forgo the more time-consuming process of obtaining a youthful offender indictment, and the attendant possibility of harsher penalties, in exchange for the certainty of swift prosecution on a delinquency complaint. Alternatively, where it is not feasible to obtain a timely youthful offender indictment before a defendant’s eighteenth birthday, the statutory scheme permits the Commonwealth instead to file a delinquency complaint after the eighteenth birthday and to seek a transfer to Superior Court, where he or she will be tried as an adult.11
To be sure, such brief (and presumably infrequent) delays in [647]*647prosecution will, for some defendants, occasion a “crossing of the Rubicon” into adult court. There is thus an element of arbitrariness, as the dissent notes, see post at 649-650, in whether an individual will be tried as a juvenile or as an adult, depending on factors such as when a complainant comes forward and the length of time the grand jury is likely to take to return an indictment in a given case; a 17.5 year old may face a significantly different proceeding, with differing goals and outcomes, than a 17.9 year old might later confront in an adult court. This result, however, is ordained by the statutory framework that both provides for limited Juvenile Court jurisdiction over a class of defendants of a certain age and intends that a defendant will not “fall ‘between the cracks’ and be free from prosecution where the [defendant] is apprehended after his eighteenth birthday.” Commonwealth v. Porges, 460 Mass. 525, 531 (2011). At a certain point, an individual will reach a level of maturity at which he or she is deemed competent to answer as an adult for his or her past actions. The Legislature has determined the age marking that point of maturity, and once an individual has reached it, a youthful offender indictment may no longer issue.
Were this cutoff point not enforced, moreover, the Commonwealth would have an indeterminate period of time in which to change its charging decision after a juvenile turned eighteen, thereby introducing unnecessary uncertainty and unwelcome delay into the juvenile system, and thwarting the prompt and effective administration of juvenile justice. See, e.g., J.A. Butts, G.R. Cusick, & B. Adams, Delays in Youth Justice 4 (2009) (“Especially given the developmental immaturity of adolescents, swift intervention is likely to be more effective with youthful offenders, both in achieving the specific deterrent effects of punishment and in realizing the potential benefits of treatment and other services. Improving the timeliness of the justice process is far more than a technical matter for managers and judges. It is a critical part of policy and practice in ensuring that the youth justice system fulfills its basic mission”); Butts & Sanborn, Is Juvenile Justice Just Too Slow? 83 Judicature 16, 18 (1999) (“Delays in juvenile justice may be uniquely harmful. Adolescents are socially, emotionally, and cognitively different from adults. Particularly during stressful circumstances, adolescents exhibit a [648]*648sense of ‘futurelessness’ in evaluating the possible risks associated with personal behavior and choices. Negative consequences that might be enforced sometime in the future do not exert much influence over a juvenile’s behavior. The very nature of adolescent psychology reduces the perceived immediacy of delayed sanctions — even delays considered routine in adult court. A slow court process also reduces the ability of the juvenile justice system to intervene in the budding careers of young, repeat offenders”). By contrast, respecting an individual’s eighteenth birthday as a deadline by which to bring a youthful offender indictment ensures that juveniles will either be proceeded against in Juvenile Court in a timely manner or, upon aging out of the Juvenile Court system, will be afforded a transfer hearing pursuant to G. L. c. 119, § 72A.
4. Conclusion. For the reasons stated, we answer the first reported question, “The term ‘apprehension’ in G. L. c. 119, § 72A, refers to the time of commencement of process (i.e., when a summons issues), provided the juvenile is ‘available’ to the court at that point.” We answer the second reported question, “No,” and the fourth reported question, “No.” Because of our answer to the second reported question, we do not answer the third reported question. The matter is remanded to the Juvenile Court for further proceedings consistent with this opinion.
So ordered.