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No. 4: Scott Duncan

Age: 29
Net Worth: $4.1 billion

Scott Duncan is one of four children of the late energy pipeline entrepreneur Dan Duncan, the former richest man in Houston, who died in 2010 at age 77. Scott added $1 billion to his fortune in the last year as the company's share price climbed by one-fourth.


More From Forbes:
The World’s Billionaires
The World’s Billionaire Newcomers
The World’s Billionaire Dropoffs
The Oldest Billionaires in the World

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