Mark Zuckerberg, 28 - worth $16.4 billion*
The best known of the pack has been in the news lately for his high-profile stock: Facebook. The social networking site was founded in 2004 during Zuckerberg's time at Harvard.
* According to the Bloomberg Billionaires Index
Yang Huiyan, 30 - worth around $4.7 billion
Huiyan's father Yeung Kwok Keung created the high-end Chinese real estate development company Country Garden Group. Prior to the company's Hong Kong IPO in 2007, Keung transferred his shares to his daughter.