I don't think I will ever be able to retire. I've been putting money into retirement accounts for years but the magic of compound interest that I read about when I was younger appears to be no more real than unicorns.

But I have many friends who are retired and are very busy. Some ride bikes almost every day but others have also taken up activities like kayaking. Some travel a lot.

I don't think of volunteering as slave labor. I guess it depends on where you volunteer and what you're doing.