A lot of information here (although approx 3 years dated at this point): http://successfuldropout.com/37-live-lifetimes-average-person-high-school-college-dropout-braun-shedd/
Also run the SF/SV Successful Dropouts meetup. If anyone wants to chat personally or with plenty of other dropouts about their path, come and join us! https://www.meetup.com/SF-Successful-Dropouts-Meetup