I don't think there is really one answer to this. I'd be surprised if people's hobbies and interests are really this stable across a lifetime. If you'd have asked me five years ago, all my hobbies were very close to my actual job and I'd have been building compute labs and writing infrastructure orchestration software for fun. Ten years ago, I was more into amateur data analytics and I'd have at least wanted to try setting up my own BCS computer ranking for NCAA football. 20 years ago, it would have been photography and travel writing. Right now, I'd be all-in on personal athletics, trying to continue lifting and rehab my old fledgling habits of climbing and swimming, but mostly doubling down on running since it's what I'm best at and it consumes a lot of time anyway. I'd also love to get involved in big cat rescue, but with the success pumas are already having in the Americas, the need is probably mostly in Eurasia and Africa and I don't think I'd want to leave the only continent I've ever called home. Family still matters. I'd move closer to them, not farther.
Given all this history, I'm definitely not going to pretend I have any idea what I'm going to want to do when I actually retire. I'm also not alone. What I really end up doing is contingent on not disupting whatever my wife wants to do.