My old fella is 58 and have been trying to advise him to do the same, even if it's 8 hours a week or voluntary work. He won't have it though and is on about staying part time at 60 where he is, in a job he hates.
It's crazy staying in a job you hate when you consider you probably spend half your life at work. That means half your life you've been miserable. I know the majority would rather be at home with their feet up but given that isn't really feasible at least try and do something you enjoy.