11. Sergey Brin

Co-founder, Google 
Age: 38 
Industry: Technology

After sharing responsibility for Google's day-to-day operations for 10 years, Brin and Larry Page are officially decoupled -- on this list and at the Googleplex. With Page running the show, Google's other golden boy now devotes his time to special projects, many of them in stealth mode. 

Cutting loose: Billionaire Brin is apparently having some fun too. His 
Google page shows newly uploaded photos of himself skydiving and scuba diving in Egypt's Red Sea. He has also invested $5 million in a Virginia-based space tourism company and is waiting for his private ride into space. 

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