Cite as: 507 U. S. 604 (1993)
Opinion of the Court
ported by objective fact . . . . 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." Id., at 231.
Thus the ADEA commands that "employers are to evaluate [older] employees . . . on their merits and not their age." Western Air Lines, Inc. v. Criswell, 472 U. S. 400, 422 (1985). The employer cannot rely on age as a proxy for an employee's remaining characteristics, such as productivity, but must instead focus on those factors directly.
When the employer's decision is wholly motivated by factors other than age, the problem of inaccurate and stigmatizing stereotypes disappears. This is true even if the motivating factor is correlated with age, as pension status typically is. Pension plans typically provide that an employee's accrued benefits will become nonforfeitable, or "vested," once the employee completes a certain number of years of service with the employer. See 1 J. Mamorsky, Employee Benefits Law § 5.03 (1992). On average, an older employee has had more years in the work force than a younger employee, and thus may well have accumulated more years of service with a particular employer. Yet an employee's age is analytically distinct from his years of service. An employee who is younger than 40, and therefore outside the class of older workers as defined by the ADEA, see 29 U. S. C. § 631(a), may have worked for a particular employer his entire career, while an older worker may have been newly hired. Because age and years of service are analytically distinct, an employer can take account of one while ignoring the other, and thus it is incorrect to say that a decision based on years of service is necessarily "age based."
The instant case is illustrative. Under the Hazen Paper pension plan, as construed by the Court of Appeals, an employee's pension benefits vest after the employee completes 10 years of service with the company. Perhaps it is true
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