This is my dad....he was a navy pilot but never flew 121. He is exactly 66 years old. (Way to go Dad, most fit person I know, like 3% body fat or something crazy like that...photo taken last week.) Though, he suffered a heart attack at age 38 while surfing. To echo @
ChasenSFO , age is not necessarily the best indicator of health, on EITHER end of the spectrum. My pops is proof. At 38 he could have held a medical and been flying....today, he would apparently be too "old." Not sure what the solution is, there must be some limits, but a blanket rule definitely doesn't cover the outliers.