I'm no longer young and I have family, so simply packing my bags and touring the world is out. Can't take my kids for a 1y world tour either, the school system doesn't allow it. Going on expeditions would saddle my wife with the full child care, something I dare not ask. Just staying at home for the kids would probably get boring.
I did like to code, but 10y in enterprise have cooled me to it somewhat and I feel my age. Just joining some OSS project to kill time isn't that great either if you just dropped your coding job.
I don't really know how to socialize and have no (next to no) friends. And those that I have, I tend to neglect for some reason.
I have some ADHD traits and the older I get, the harder I find it to focus for longer times or concentrate deeply enough to really solve challenging problems, so I doubt I'll start 3D-printing the next drone generation or rebuild a vintage car or something.
It's a weird problem to have, but I feel like not retiring so I don't bore myself to death.