Split from the Nicholas Parsons thread.
I can't think of any job that I might do that I'd enjoy doing so much that I'd carry on into my 90s.
I read something recently (but have no idea where) that the sort of person who wants money, or fame, or applause, or similar, can never actually get enough whereas if the things which make you happy are things like friends or bike rides there isn't the same more, more, more driver.
With people like actors, the rest of us benefit from this behaviour.
With people like Rupert Murdoch, less so.