First tour when I was just barely 22. 1500 miles. Then I did some 300+ mile solo tours in Canada and Colorado, and lots of overnights and sub-200 mile jaunts.
I worked freelance between graduating from college and grad school (where I am now). I'm 24 now, and my girlfriend Kelley (22) and I are planning a summer tour, likely in the northeast but perhaps the West Coast.
Cheers!