Youngest Billionaires of 2013
 

The two most popular ways to get on the list of Youngest Billionaires of 2013 ? Be a Facebook shareholder or inherit your money. Mark Zuckerberg Age: 28 Net Worth: $13.3 billion Few CEOs of any age are under more media scrutiny than Mark Zuckerberg (who's only 8 days older than Moskovitz). Since taking Facebook public in May 2012, and getting married days later, the hoodie-wearing founder has seen his net worth rise and fall with every fluctuation of the stock price.

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