to observe the terms of * * * any bona fide employee benefit plan such as a retirement, pension, or insurance plan, which is not a subterfuge to evade the purposes of this Act, except that no such employee benefit plan shall excuse the failure to hire any individual, and no such * * * employee benefit plan shall require or permit the involuntary retirement of any individual specified by section 12(a) of this Act because of the age of such individuals.
The legislative history of this provision indicates that its purpose is to permit age-based reductions in employee benefit plans where such reductions are justified by significant cost considerations. Accordingly, section 4(f)(2) does not apply, for example, to paid vacations and uninsured paid sick leave, since reductions in these benefits would not be justified by significant cost considerations. Where employee benefit plans do meet the criteria in section 4(f)(2), benefit levels for older workers may be reduced to the extent necessary to achieve approximate equivalency in cost for older and younger workers. A benefit plan will be considered in compliance with the statute where the actual amount of payment made, or cost incurred, in behalf of an older worker is equal to that made or incurred in behalf of a younger worker, even though the older worker may thereby receive a lesser amount of benefits or insurance coverage. Since section 4(f)(2) is an exception from the general non-discrimination provisions of the Act, the burden is on the one seeking to invoke the exception to show that every element has been clearly and unmistakably met. The exception must be narrowly construed. The following sections explain three key elements of the exception:
There is also a discussion of the application of the general rules governing all plans with respect to specific kinds of employee benefit plans.
29 C.F.R. §1625.10