[repomies691]

> I can only assume the "nothing to do" retirement crowd didn't do much when they were working, and therefore have no idea how to fill the time.

Well, the common pattern seems to be for those who retire early that it was preceded with a lots of work. That was also my case. At some point I just realised that I want to do something else, and I had enough savings for lifetime so money wasn't any kind of motivator any more. So, previously I was working 24/7, then suddenly I was working only couple of hours a week. Slowly I started picking things to do, but it takes a lot of time to find hobbies etc.