Google co-founders rank 5th among richest Americans

Larry Page and Sergey Brin crack the list of 10 wealthiest people in the U.S. for the first time.

Watch out Bill!

Google co-founder Sergey Brin is worth $18.5 billion. Google

Google co-founder Larry Page is worth $18.5 billion. Google

Google co-founders Sergey Brin and Larry Page, each worth an estimated $18.5 billion, have joined the ranks of the top 10 richest people in the U.S., according to Forbes magazine's list of the 400 most wealthy Americans.

The 34-year-olds are tied for fifth place, behind Microsoft founder Bill Gates, who is worth $59 million; investment mogul Warren Buffett at $52 billion; casino and hotel magnate Sheldon Adelson at $28 billion; and Oracle Chief Executive Larry Ellison at $26 billion.