Google Founders Sergey Brin and Larry Page, both 34 years old and both worth $18.5 billion each, are now 5th in the Forbes list of the 400 richest Americans. Last year they were worth $14.1 billion each and were in the 12th spot.
The Google boys are still #2 in the rich list of silicon valley. In third place is Lawrence Ellison of Oracle fame, who is worth $26 billion.
Holding the first spot (not restricted to this list) still is Bill Gates with $59 billion dollars who rose from last year's $53 billion. Another interesting silicon valley fella in the top 10 list was Michael Dell in the 8th position with $17.42 billion.
Click here to find out how young billionaires play.