20 Youngest billionaires on Forbes 400

Last week, Forbes released it's list of the 400 richest people in the world. 20 people on that list were below the age of 50.

The list, released annually, was topped by Bill Gates for the 20th year in a row. Warren Buffett, who came in second on the list, was the years biggest dollar gainer. Buffett added $12.5 billion to his fortune.

Six Oklahomans made the list, earning their billions through various businesses. Click here to see that slideshow. One famous Oklahoman who didn't make it: T. Boone Pickens.