14) Eduardo Saverin (Age: 32; Net worth: $4.8 billion)

Eduardo Saverin is one of the founders of social media company Facebook. Currently he lives in Singapore where he has been making investments in international technology startups. Saverin also co-founded Los Angeles-based private equity firm Velos Partners. His investments include high-end airport car rental service Silvercar and Hampton Creek Foods.

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13) Scott Duncan (Age: 32; Net worth: $6.2 billion)

Enterprise Products Partners L. P. is one of the largest publicly-traded energy partnerships in North America. Scott Duncan is the youngest of the four Duncan heirs, the children of Dan Duncan, the founder of this business empire.