Here is a list profiling young entrepreneurs at the top of their fields. All under 30, these young millionaires are famous and successful entrepreneurs. Some may even be top billionaires. http://www.retireat21.com/top-young-entrepreneurs/
http://www.ranker.com/list/the-top-young-entrepreneurs-_under-30_/worlds-richest-people-lists,
Andrew Gower
Blake Ross
Chad Hurley
Mark Zuckerberg
Johann Schleier-Smith
Andrew Michael
Angelo Sotira
John Vechey
Jake Nickell
David Hyatt