According to the Forbes Billionaires list in 2014, 31 of the 1,645 members are under the age of 40. That elite group no longer includes Google's Sergey Brin and Larry Page as both of whom have crossed into their 40's.

This year, there's a newcomer to the list - Perenna Kei who displaces former Facebook cofounder Dustin Moskovitz as the youngest billionaire.

Let's take a look at the top 10 youngest billionaires in the world in 2014, according to Forbes.com.

No 10: Fahd Hariri

Age: 33

Net Worth: $1.2 billion

Fahd Hariri is the youngest son of slain Lebanese Prime Minister Rafik Hariri. He graduated from the Ecole Spéciale d'Architecture de Paris in 2004.

　　Fahd Hariri [File photo]