Au contraire, a surprising percentage of pilots seem to shuffle off shortly AFTER retiring. One could argue that 66 is a dangerous age, but it seems to have been the same story when retiral was at 60.
Waking up at awful o'clock/spending the night in a metal tube/time zone changes/ atmospheric pressure changes/DVT/cosmic radiation /crew meals etc etc . . . all bad for us, but, there are other stresses associated with retirement, and we haven't been acclimatising to them for 40 odd year.
It seems in many cases our tired old bodies ( & minds) don't adapt too well to the "stresses" being turned off /or don't much appreciate adapting to new/ novel ones.