These Are the 5 Youngest Billionaires in America

Three of them are self-made, and the other two are heirs. But they all have three things in common: They're young, they're American and they're billionaires.

On Tuesday, Forbes released its annual Forbes 400 list, which chronicles the 400 richest billionaires in the United States. While Forbes says the average age of the billionaires on the list is 67, several of its members are far younger — with two of them in their 20s, and 14 under the age of 40.