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America's 10 Youngest Billionaires

John Arnold

Net Worth: $3.3 billion
Source: hedge funds
Age: 36

The former Enron oil trader founded hedge fund Centaurus after the energy outfit famously collapsed. His fund now has $5 billion under management, and he and his wife Laura recently pledged half of their wealth to the Gates-Buffet challenge.

(AP Photo/J. Scott Applewhite)

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