That is exactly what I do now. Every question I've ever had I now have the time to devote to answering it. I take classes, I volunteer, I mentor Comp. Sci. students. But, more than anything, I still write code. I spent the last few months creating an LLM from scratch which was incredibly fun.

That said, I have a friend who will probably work until he dies. His only real interest in life is his job. I'm not suggesting that is a bad thing; its more to the point that "retirement" isn't a panacea for everyone.