I'm 51, so I figure I'd better get this right pretty soon. :) I think about this a lot, though. The common thread through the last 25 years, though, is that I've worked for myself. That's a lot of years without a safety net, and it's also a lot of years to learn habits that would make it almost impossible for me to work for someone else.
About 20 years ago, though, I put together this list. At the time, I felt like most of my life was ahead of me and that I wanted as many options as possible. So there's very different from each other, and it was just me dreaming one day:
