So is the argument about whether a person of a certain age is fit (on objective criteria) to do a job, or about making way for younger people?
If the first, age is irrelevant (other than perhaps as a statistical yardstick);
if the second, then what other field does a Logan's Run-type cull simply so as to make room for newcomers? Why not just kill everyone on their 45th birthday? That'd solve the health and unfunded-pensions problems in one go.
