What do billionaires Jeff Bezos, Mark Cuban and Richard Branson have in common?
They each started their first business before graduating high school.
Stories of 20-somethings launching start-ups from their dorm rooms seem to pop up everywhere, but it seems entrepreneurs are getting even younger.
While they aren't billionaires yet, these eight entrepreneurs under 18 years old are making a name for themselves—and some serious cash.
—By CNBC's Sarah Whitten
Posted 27 July 2015