Doesnt necessarily have to be a job.
But if it is paid work, so much the better, Probably.
I know someone who is now semi retired, but still needs his adrenaline fix. He is still healthy and active. He wont go back to his old job I dont think, as after x number of years, he is somewhat fed up with it.
Doesnt want too many hours used up, but on the other hand, in his words, "doesnt want to sit around all day".
So far, he has been off sailing[he is not a sailor], and encountered stormy waters. Literally. His family is not keen for him to go down that particular route again. He himself, found it a "bit challenging". But we all know he needs something. Trouble is, what else?