I had a long conversation with my brother, who never wanted to retire ever, and his reason was basically "what would I even do with all the time I have". My inability to answer that haunts me every day. I still don't know.
I don't think both of those combined would fill my time from when I'm 40 until I die. I'd have to find something that really occupies me (like maybe I start a big open source project or something) but at that point I'm just finding work that I don't get paid for.
