Just to add my threepenn'th.
I had to retire at 60 and, quite honestly, I'd had enough of the present Airline business by this time - well, certainly of operating out of LHR.
My gripe is they wouldn't even let me carry on flying a light twin for a living, - or rather a paying hobby.
Trouble is I'm fortunate enough to be as fit as a fiddle and I'm just not ready, mentally, to pack it up at an instant. I really hoped for a gentle reduction in the demands on me.
I actually fly because I always wanted to,because I actually enjoy it and because I'd probably go to an early grave if I was forced to stop flying altogether !
In the meantime I teach aerobatics.
Regards, Sleeve.