they're just "prematurely" tired and worn out.
Forgive me if I tread on a difficult subject, but your father passed away at an age somewhere between average and old for every generation before his. 40+ years of physical labour has and will always take its toll and there would have been nothing premature or unusual had he been an Elizabethen shipwright.Were this still the norm, then the focus would still be on working life health checkups and realising we cannot lift into our 70s. I think perhaps we are missing something there.
I suspect it might be worth linking retirement payouts to total calories burnt over a working life. Sitting at a desk might not be such a good career move :-)
Please again - I saw your point about your father as noteworthy and I wanted to recognise that - no offense or other comment meant