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3) Mark Zuckerberg(3 of 10)
3) Mark Zuckerberg(3 of 10)
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At only 30 years old, the co-founder of Facebook is the richest person in the world under the age of 35. Forbes lists him as the No. 11 richest billionaire in America, and the No. 14 richest in the world.
His net worth is estimated at $42.5 billion.