My Father in Law is 72 this year, still travels all over the world for work, down to London every week.
He has a very bad back, can only see out of 1 eye properly, hes an utter menace on the roads.
He was a Docker back in the day, my Wife tells me stories about how much they struggled when she was younger, I think that factors into why hes still working himself to death. But as you say, if he stopped......
A lot of fellas I know who didn`t want to retire, was also not wanting to be stuck at home with their missus too, as she`d find all kinds of stuff for them to do, that they didn`t want to do lol