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  During the deliberations that preceded the enactment of the Civil Rights Act of 1964, Congress considered and rejected proposed amendments that would have included older workers among the classes protected from employment discrimination. See 110 Cong. Rec. 2596-2599 (1964) (amendment offered by Rep. Dowdy, voted down 123 to 94); id., at 9911-9913, 13490-13492 (amendment offered by Sen. Smathers, voted down 63 to 28). General Dynamics Land Systems, Inc. v. Cline, 540 U.S. 581, 587, 157 L. Ed. 2d 1094, 124 S. Ct. 1236 (2004). Congress did, however, request the Secretary of Labor to 'make a full and complete study of ...