My goal was to retire at 52 (possible where I worked) and I did. Of course, I had a big pay cut but I was just too burnt out from working 30 years at the same place. (After that amount of time, you've seen everything go around and around and there's nothing that hasn't been done before. But only you can see it because everyone else still has hope.)

After two years, I was so lonely and aimless that I went back to work for another five years at a different place in a new state. If you have enough money to travel, if you can volunteer, if you can do anything to have a goal, you will be fine. You need a purpose in life even when you're old. Today, I live alone with my little dog. My purpose is just to watch time pass.