Here's a list I found via List of the Day. Coed magazine makes a pretty good case in point here. There's only a few mistakes on here I've made... mostly not traveling enough.
I did get married too young, but that ended up working out for me.
I did spend too much money on useless crap, and that didn't work out for me.
Even though I didn't finish school in my twenties, I did finish in my thirties.
Can I hear a woot woot?