[228]*228Justice Brennan
delivered the opinion of the Court.
Under the Age Discrimination in Employment Act of 1967, 81 Stat. 602, as amended, 29 U. S. C. § 621 et seq. (1976 ed. and Supp. V) (ADEA or Act), it is unlawful for an employer [229]*229to discriminate against any employee or potential employee on the basis of age, except “where age is a bona fide occupational qualification reasonably necessary to the normal operation of the particular business, or where the differentiation is based on reasonable factors other than age.”1 The question presented in this case is whether Congress acted constitutionally when, in 1974, it extended the definition of “employer” under § 11(b) of the Act to include state and local governments. The United States District Court for the District of Wyoming, in an enforcement action brought by the Equal Employment Opportunity Commission (EEOC or Commission), held that, at least as applied to certain classes of state workers, the extension was unconstitutional. 514 F. Supp. 595 (1981). The Commission filed a direct appeal under 28 U. S. C. §1252, and we noted probable jurisdiction. 454 U. S. 1140 (1982). We now reverse.
M
Efforts in Congress to prohibit arbitrary age discrimination date back at least to the 1950’s.2 During floor debate over what was to become Title VII of the Civil Rights Act of 1964, amendments were offered in both the House and the Senate to ban discrimination on the basis of age as well as race, color, religion, sex, and national origin. These amendments were opposed at least in part on the basis that Congress did not yet have enough information to make a considered judgment about the nature of age discrimination, and each was ultimately defeated. 110 Cong. Rec. 2596-2599, 9911-9913, 13490-13492 (1964); EEOC, Legislative History of the Age Discrimination in Employment Act 5-14 (1981) (hereinafter Legislative History). Title VII did, however, [230]*230include a provision, § 715, 78 Stat. 265 (since superseded by § 10 of the Equal Employment Opportunity Act of 1972, 86 Stat. Ill), which directed the Secretary of Labor to “make a full and complete study of the factors which might tend to result in discrimination in employment because of age and of the consequences of such discrimination on the economy and individuals affected,” and to report the results of that study to Congress. That report was transmitted approximately one year later. Report of the Secretary of Labor, The Older American Worker: Age Discrimination in Employment (1965), Legislative History 16-41.
In 1966, Congress directed the Secretary of Labor to submit specific legislative proposals for prohibiting age discrimination. Fair Labor Standards Amendments of 1966, § 606, 80 Stat. 845. The Secretary transmitted a draft bill in early 1967, see 113 Cong. Rec. 1377 (1967), and the President, in a message to Congress on older Americans, recommended its enactment and expressed serious concern about the problem of age discrimination, see Special Message to the Congress Proposing Programs for Older Americans, 1 Public Papers of the Presidents, Lyndon B. Johnson, 1967, pp. 32, 37 (1968). Congress undertook further study of its own, and Committees in both the House and the Senate conducted detailed hearings on the proposed legislation. See Age Discrimination in Employment: Hearings on S. 830 and S. 788 before the Subcommittee on Labor of the Senate Committee on Labor and Public Welfare, 90th Cong., 1st Sess. (1967); Age Discrimination in Employment: Hearings on H. R. 3651 et al. before the General Subcommittee on Labor of the House Committee on Education and Labor, 90th Cong., 1st Sess. (1967); see also Retirement and the Individual: Hearings before the Subcommittee on Retirement and the Individual of the Senate Special Committee on Aging, 90th Cong., 1st Sess. (1967).
The report of the Secretary of Labor, whose findings were confirmed throughout the extensive factfinding undertaken [231]*231by the Executive Branch and Congress, came to the following basic conclusions: (1) Many employers adopted specific age limitations in those States that had not prohibited them by their own antidiscrimination laws, although many other employers were able to operate successfully without them. (2) In the aggregate, these age limitations had a marked effect upon the employment of older workers. (3) Although age discrimination rarely was based on the sort of animus motivating some other forms of discrimination, it was based in large part on stereotypes unsupported by objective fact, and was often defended on grounds different from its actual causes. (4) Moreover, the available empirical evidence demonstrated that arbitrary age lines were in fact generally unfounded and that, as an overall matter, the performance of older workers was at least as good as that of younger workers. (5) Finally, arbitrary age discrimination was profoundly harmful in at least two ways. First, it deprived the national economy of the productive labor of millions of individuals and imposed on the governmental treasury substantially increased costs in unemployment insurance and federal Social Security benefits. Second, it inflicted on individual workers the economic and psychological injury accompanying the loss of the opportunity to engage in productive and satisfying occupations.
The product of the process of factfinding and deliberation formally begun in 1964 was the Age Discrimination in Employment Act of 1967. The preamble to the Act emphasized both the individual and social costs of age discrimination.3 [232]*232The provisions of the Act as relevant here prohibited various forms of age discrimination in employment, including the discharge of workers on the basis of their age. §4(a), 29 U. S. C. § 623(a).4 The protection of the Act was limited, however, to workers between the ages of 40 and 65, § 12(a), 29 U. S. C. § 631, raised to age 70 in 1978, Age Discrimination in Employment Act Amendments of 1978, § 3(a), 92 Stat. 189. Moreover, in order to insure that employers were per[233]*233mitted to use neutral criteria not directly dependant on age, and in recognition of the fact that even criteria that are based on age are occasionally justified, the Act provided that certain otherwise prohibited employment practices would not be unlawful “where age is a bona fide occupational qualification reasonably necessary to the normal operation of the particular business, or where the differentiation is based on reasonable factors other than age.” § 4(f)(1), 29 II. S. C. § 623(f)(1).
The ADEA, as originally passed in 1967, did not apply to the Federal Government, to the States or their political subdivisions, or to employers with fewer thafi 25 employees. In a Report issued in 1973, a Senate Committee found this gap in coverage to be serious, and commented that “[t]here is . . . evidence that, like the corporate world, government managers also create an environment where young is somehow better than old.” Senate Special Committee on Aging, Improving the Age Discrimination Law, 93d Cong., 1st Sess., 14 (Comm.
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[228]*228Justice Brennan
delivered the opinion of the Court.
Under the Age Discrimination in Employment Act of 1967, 81 Stat. 602, as amended, 29 U. S. C. § 621 et seq. (1976 ed. and Supp. V) (ADEA or Act), it is unlawful for an employer [229]*229to discriminate against any employee or potential employee on the basis of age, except “where age is a bona fide occupational qualification reasonably necessary to the normal operation of the particular business, or where the differentiation is based on reasonable factors other than age.”1 The question presented in this case is whether Congress acted constitutionally when, in 1974, it extended the definition of “employer” under § 11(b) of the Act to include state and local governments. The United States District Court for the District of Wyoming, in an enforcement action brought by the Equal Employment Opportunity Commission (EEOC or Commission), held that, at least as applied to certain classes of state workers, the extension was unconstitutional. 514 F. Supp. 595 (1981). The Commission filed a direct appeal under 28 U. S. C. §1252, and we noted probable jurisdiction. 454 U. S. 1140 (1982). We now reverse.
M
Efforts in Congress to prohibit arbitrary age discrimination date back at least to the 1950’s.2 During floor debate over what was to become Title VII of the Civil Rights Act of 1964, amendments were offered in both the House and the Senate to ban discrimination on the basis of age as well as race, color, religion, sex, and national origin. These amendments were opposed at least in part on the basis that Congress did not yet have enough information to make a considered judgment about the nature of age discrimination, and each was ultimately defeated. 110 Cong. Rec. 2596-2599, 9911-9913, 13490-13492 (1964); EEOC, Legislative History of the Age Discrimination in Employment Act 5-14 (1981) (hereinafter Legislative History). Title VII did, however, [230]*230include a provision, § 715, 78 Stat. 265 (since superseded by § 10 of the Equal Employment Opportunity Act of 1972, 86 Stat. Ill), which directed the Secretary of Labor to “make a full and complete study of the factors which might tend to result in discrimination in employment because of age and of the consequences of such discrimination on the economy and individuals affected,” and to report the results of that study to Congress. That report was transmitted approximately one year later. Report of the Secretary of Labor, The Older American Worker: Age Discrimination in Employment (1965), Legislative History 16-41.
In 1966, Congress directed the Secretary of Labor to submit specific legislative proposals for prohibiting age discrimination. Fair Labor Standards Amendments of 1966, § 606, 80 Stat. 845. The Secretary transmitted a draft bill in early 1967, see 113 Cong. Rec. 1377 (1967), and the President, in a message to Congress on older Americans, recommended its enactment and expressed serious concern about the problem of age discrimination, see Special Message to the Congress Proposing Programs for Older Americans, 1 Public Papers of the Presidents, Lyndon B. Johnson, 1967, pp. 32, 37 (1968). Congress undertook further study of its own, and Committees in both the House and the Senate conducted detailed hearings on the proposed legislation. See Age Discrimination in Employment: Hearings on S. 830 and S. 788 before the Subcommittee on Labor of the Senate Committee on Labor and Public Welfare, 90th Cong., 1st Sess. (1967); Age Discrimination in Employment: Hearings on H. R. 3651 et al. before the General Subcommittee on Labor of the House Committee on Education and Labor, 90th Cong., 1st Sess. (1967); see also Retirement and the Individual: Hearings before the Subcommittee on Retirement and the Individual of the Senate Special Committee on Aging, 90th Cong., 1st Sess. (1967).
The report of the Secretary of Labor, whose findings were confirmed throughout the extensive factfinding undertaken [231]*231by the Executive Branch and Congress, came to the following basic conclusions: (1) Many employers adopted specific age limitations in those States that had not prohibited them by their own antidiscrimination laws, although many other employers were able to operate successfully without them. (2) In the aggregate, these age limitations had a marked effect upon the employment of older workers. (3) Although age discrimination rarely was based on the sort of animus motivating some other forms of discrimination, it was based in large part on stereotypes unsupported by objective fact, and was often defended on grounds different from its actual causes. (4) Moreover, the available empirical evidence demonstrated that arbitrary age lines were in fact generally unfounded and that, as an overall matter, the performance of older workers was at least as good as that of younger workers. (5) Finally, arbitrary age discrimination was profoundly harmful in at least two ways. First, it deprived the national economy of the productive labor of millions of individuals and imposed on the governmental treasury substantially increased costs in unemployment insurance and federal Social Security benefits. Second, it inflicted on individual workers the economic and psychological injury accompanying the loss of the opportunity to engage in productive and satisfying occupations.
The product of the process of factfinding and deliberation formally begun in 1964 was the Age Discrimination in Employment Act of 1967. The preamble to the Act emphasized both the individual and social costs of age discrimination.3 [232]*232The provisions of the Act as relevant here prohibited various forms of age discrimination in employment, including the discharge of workers on the basis of their age. §4(a), 29 U. S. C. § 623(a).4 The protection of the Act was limited, however, to workers between the ages of 40 and 65, § 12(a), 29 U. S. C. § 631, raised to age 70 in 1978, Age Discrimination in Employment Act Amendments of 1978, § 3(a), 92 Stat. 189. Moreover, in order to insure that employers were per[233]*233mitted to use neutral criteria not directly dependant on age, and in recognition of the fact that even criteria that are based on age are occasionally justified, the Act provided that certain otherwise prohibited employment practices would not be unlawful “where age is a bona fide occupational qualification reasonably necessary to the normal operation of the particular business, or where the differentiation is based on reasonable factors other than age.” § 4(f)(1), 29 II. S. C. § 623(f)(1).
The ADEA, as originally passed in 1967, did not apply to the Federal Government, to the States or their political subdivisions, or to employers with fewer thafi 25 employees. In a Report issued in 1973, a Senate Committee found this gap in coverage to be serious, and commented that “[t]here is . . . evidence that, like the corporate world, government managers also create an environment where young is somehow better than old.” Senate Special Committee on Aging, Improving the Age Discrimination Law, 93d Cong., 1st Sess., 14 (Comm. Print 1973), Legislative History 231. In 1974, Congress extended the substantive prohibitions of the Act to employers having at least 20 workers, and to the Federal and State Governments.6
[234]*234Prior to the District Court decision in this case, every federal court that considered the question upheld the constitutionality of the 1974 extension of the Age Discrimination in Employment Act to state and local workers as an exercise of Congress’ power under either the Commerce Clause or § 5 of the Fourteenth Amendment.6
This case arose out of the involuntary retirement at age 55 of Bill Crump, a District Game Division supervisor for the Wyoming Game and Fish Department. Crump’s dismissal was based on a Wyoming statute that conditions further employment for Game and Fish Wardens who reach the age of 55 on “the approval of [their] employer.”7 Crump filed a [235]*235complaint with the EEOC, alleging that the Game and Fish Department had violated the Age Discrimination in Employment Act. After conciliation efforts between the Commission and the Game and Fish Department failed, the Commission filed suit in the District Court for the District of Wyoming against the State and various of its officials seeking declaratory and injunctive relief, backpay, and liquidated damages on behalf of Mr. Crump and others similarly situated.
The District Court, upon a motion by the defendants, dismissed the suit. It held that the Age Discrimination in Employment Act violated the doctrine of Tenth Amendment immunity articulated in National League of Cities v. Usery, 426 U. S. 833 (1976), at least insofar as it regulated Wyoming’s employment relationship with its game wardens and other law enforcement officials. 514 F. Supp., at 600. The District Court also held, citing Pennhurst State School and Hospital v. Halderman, 451 U. S. 1 (1981), that the application of the ADEA to the States could not be justified as an exercise of Congress’ power under §5 of the Fourteenth Amendment because Congress did not explicitly state that it invoked that power in passing the 1974 amendments. 514 F. Supp., at 600.
Ill
The appellees have not claimed either in the District Court or in this Court that Congress exceeded the scope of its affirmative grant of power under the Commerce Clause8 in enacting the ADEA. See generally National League of Cities v. Usery, supra, at 840-841; Heart of Atlanta Motel, Inc. v. [236]*236United States, 379 U. S. 241, 243-244 (1964). Rather, the District Court held and appellees argue that, at least with respect to state game wardens, application of the ADEA to the States is precluded by virtue of external constraints imposed on Congress’ commerce powers by the Tenth Amendment.
A
National League of Cities v. Usery struck down Congress’ attempt to extend the wage and hour provisions of the Fair Labor Standards Act to state and local governments. National League of Cities was grounded on a concern that the imposition of certain federal regulations on state governments might, if left unchecked, “allow ‘the National Government [to] devour the essentials of state sovereignty,”’ 426 U. S., at 855 (quoting Maryland v. Wirtz, 392 U. S. 183, 205 (1968) (Douglas, J., dissenting)). It therefore drew from the Tenth Amendment an “affirmative limitation on the exercise of [congressional power under the Commerce Clause] akin to other commerce power affirmative limitations contained in the Constitution.” 426 U. S., at 841. The principle of immunity articulated in National League of Cities is a functional doctrine, however, whose ultimate purpose is not to create a sacred province of state autonomy, but to ensure that the unique benefits of a federal system in which the States enjoy a “ ‘separate and independent existence,’ ” id., at 845 (quoting Lane County v. Oregon, 7 Wall. 71, 76 (1869)), not be lost through undue federal interference in certain core State functions. See FERC v. Mississippi, 456 U. S. 742, 765-766 (1982); United Transportation Union v. Long Island R. Co., 455 U. S. 678, 686-687 (1982); Hodel v. Virginia Surface Mining & Reclamation Assn., Inc., 452 U. S. 264, 286-288 (1981).9
Hodel v. Virginia Surface Mining & Reclamation Assn., Inc., supra, summarized the hurdles that confront any claim [237]*237that a state or local governmental unit should be immune from an otherwise legitimate exercise of the federal power to regulate commerce:
“[I]n order to succeed, a claim that congressional commerce power legislation is invalid under the reasoning of National League of Cities must satisfy each of three requirements. First, there must be a showing that the challenged statute regulates the ‘States as States.’ Second, the federal regulation must address matters that are indisputably ‘attribute^] of state sovereignty.’ And third, it must be apparent that the States’ compliance with the federal law would directly impair their ability ‘to structure integral operations in areas of traditional governmental functions.’” 452 U. S., at 287-288 (citations omitted; emphasis in original).
Moreover,
“Demonstrating that these three requirements are met does not . . . guarantee that a Tenth Amendment challenge to congressional commerce power action will succeed. There are situations in which the nature of the federal interest advanced may be such that it justifies state submission.” Id., at 288, n. 29 (citations omitted).
See also United Transportation Union v. Long Island R. Co., supra, at 684, and n. 9. The first requirement — that the challenged federal statute regulate the “States as States”— is plainly met in this case.10 The second requirement — that [238]*238the federal statute address an “undoubted attribute of state sovereignty” — poses significantly more difficulties.11 We need not definitively resolve this issue, however, nor do we have any occasion to reach the final balancing step of the inquiry described in Hodel,12 for we are convinced that, even if Wyoming’s decision to impose forced retirement on [239]*239its game wardens does involve the exercise of an attribute of state sovereignty, the Age Discrimination in Employment Act does not “directly impair” the State’s ability to “structure integral operations in areas of traditional governmental functions.”
B
The management of state parks is clearly a traditional state function. National League of Cities, 426 U. S., at 851. As we have already emphasized, however, the purpose of the doctrine of immunity articulated in National League of Cities was to protect States from federal intrusions that might threaten their “separate and independent existence.” Ibid. Our decision as to whether the federal law at issue here directly impairs the States’ ability to structure their integral operations must therefore depend, as it did in National League of Cities itself, on considerations of degree. See id., at 845, 852; FERC v. Mississippi, 456 U. S., at 769-770. We conclude that the degree of federal intrusion in this case is sufficiently less serious than it was in National League of Cities so as to make it unnecessary for us to override Congress’ express choice to extend its regulatory authority to the States.
In this case, appellees claim no substantial stake in their retirement policy other than “assuring] the physical preparedness of Wyoming game wardens to perform their duties.” Brief for Appellees 18.13 Under the ADEA, however, the State may still, at the very least, assess the fitness of its game wardens and dismiss those wardens whom it reasonably finds to be unfit. Put another way, the Act requires the State to achieve its goals in a more individualized and careful manner than would otherwise be the case, but it does not require the State to abandon those goals, or to abandon the public policy decisions underlying them. FERC v. Mississippi, supra, at 771; cf. n. 11, supra.
[240]*240Perhaps more important, appellees remain free under the ADEA to continue to do precisely what they are doing now, if they can demonstrate that age is a “bona fide occupational qualification” for the job of game warden. See supra, at 232-233. Thus, in distinct contrast to the situation in National League of Cities, supra, at 848, even the State’s discretion to achieve its goals in the way it thinks best is not being overridden entirely, but is merely being tested against a reasonable federal standard.
Finally, the Court’s concern in National League of Cities was not only with the effect of the federal regulatory scheme on the particular decisions it was purporting to regulate, but also with the potential impact of that scheme on the States’ ability to structure operations and set priorities over a wide range of decisions. 426 U. S., at 849-850.14 Indeed, National League of Cities spelled out in some detail how application of the federal wage and hour statute to the States threatened a virtual chain reaction of substantial and almost certainly unintended consequential effects on state decisionmaking. Id., at 846-852. Nothing in this case, however, portends anything like the same wide-ranging and profound threat to the structure of state governance.
The most tangible consequential effect identified in National League of Cities was financial: forcing the States to pay their workers a minimum wage and an overtime rate would leave them with less money for other vital state programs. The test of such financial effect as drawn in National League of Cities does not depend, however, on “particularized assessments of actual impact,” which may vary from State to State and time to time, but on a more generalized inquiry, essentially legal rather than factual, into the direct and obvious effect of the federal legislation on the ability of the States to allocate their resources. Id., at 851-852; see [241]*241Hodel, 452 U. S., at 292, n. 33. In this case, we cannot conclude from the nature of the ADEA that it will have either a direct or an obvious negative effect on state finances. Older workers with seniority may tend to get paid more than younger workers without seniority, and may by their continued employment accrue increased benefits when they do retire. But these increased costs, even if they were not largely speculative in their own right, might very well be outweighed by a number of other factors: Those same older workers, as long as they remain employed, will not have to be paid any pension benefits at all, and will continue to contribute to the pension fund. And, when they do retire, they will likely, as an actuarial matter, receive benefits for fewer years than workers who retire early.15 Admittedly, as some of the amici point out, the costs of certain state health and other benefit plans would increase if they were automatically extended to older workers now forced to retire at an early age. But Congress, in passing the ADEA, included a provision specifically disclaiming a construction of the Act which would require that the health and similar benefits received by older work[242]*242ers be in all respects identical to those received by younger workers. ADEA § 4(f)(2), 29 U. S. C. § 623(f)(2) (1976 ed. and Supp. V).16
The second consequential effect identified in National League of Cities was on the States’ ability to use their employment relationship with their citizens as a tool for pursuing social and economic policies beyond their immediate managerial goals. See, e. g., 426 U. S., at 848 (offering jobs at below the minimum wage to persons who do not possess “minimum employment requirements”). Appellees, however, have claimed no such purposes for Wyoming’s involuntary retirement statute. Moreover, whatever broader social or economic purposes could be imagined for this particular Wyoming statute would not, we are convinced, bring with them either the breadth or the importance of the state policies identified in National League of Cities.17
[243]*243
>
The extension of the ADEA to cover state and local governments, both on its face and as applied in this case, was a valid exercise of Congress’ powers under the Commerce Clause. We need not decide whether it could also be upheld as an exercise of Congress’ powers under §5 of the Fourteenth Amendment.18 The judgment of the District Court is [244]*244reversed, and the case is remanded for further proceedings consistent with this opinion.
So ordered.