I was forced to retire, at 55. Good ol’ SV ageism at work. Wasn’t happy about it -at all, but I’m fortunate, in having the means to do so.

That was almost nine years ago, and I actually increased my development work, with the caveat that no one pays me to do it, anymore.

Probably one of the best things that ever happened to me, but I didn’t think so, at the time.

I wish him luck.

He doesn't need to work, and he isn't really retiring even now. He is leaving Google but will be working on the interplanetary internet

Lots of people continue working because they enjoy it and to keep busy.