The average age is 63 years, but Facebook foundersMark Zuckerberg and Dustin Moskovitz are the youngest self-made billionaires at 28 and 29, respectively, Hurun said.
After popping more than 20% on Wednesday, Facebook foundersMark Zuckerberg and Dustin Moskovitz found their way back to the bottom on Friday, as the biggest losers in percentage terms.
Founders: Mark Diks, 45, and Pieter Diks, 44, board member Stock options: 12% interest in company Why on the list: The Diks brothers now run 400 stores in the Netherlands' formerly fragmented bedroom-furniture market.