To make a billion, you just have to change the world

There's an old saying that if you make a better mousetrap, then the world will beat a path to your door. While a new mousetrap has yet to surface, the tales of Mark Zuckerberg, Sergey Brin, and Larry Page demonstrate that changing the world can be the quickest path to fame and riches.

Most of the young people on Forbes' list of billionaires got there the old-fashioned way: They inherited their money. However, for those who are not lucky enough to be the offspring of insanely wealthy parents, there seems to be two major paths to fabulous wealth.

The first lies in knowing how money is made and figuring out how to generate some of your own. This was the route taken by the youngest billionaire in the Ukraine, Kostayantin Zhevago. Fifteen years ago, he began working as finance director of a bank; today, he holds a majority stake in its holding company. At 34, he is currently worth $3.4 billion and is a member of Ukraine's Parliament.