America's richest under 40

The Fortune magazine announced its annual list of the 40 richest Americans under the age of 40 on Wednesday.

Topping the list is Michael Dell, 39, chairman and founder of Dell Computer. With a wealth of $17.95 billion, Dell has held the No. 1 spot since the list was started in 1999.

Larry Page and Sergey Brin of Google, both 31, hold the No. 4 and No. 5 spots with total wealth of $4.19 billion and $4.17 billion, more than four times their wealth last year when they first debuted on Fortune's '40 Under 40.'

Debuting this year, celebrities such as Britney Spears, Jennifer Lopez, Julia Roberts, and the Olsen twins, said a Fortune media release.

The list and related stories appear in the September 20 issue.

"How hard is it to stay on top?" asks Fortune. "For Michael Dell, not hard at all. But for the others, remaining at the peak is no mean feat."

The top ten on the '40 Under 40' list are: 1. Michael Dell, 39, CEO & Founder, Dell Computer ($17.95 billion); 2. Pierre Omidyar, 37, Chairman & Founder, eBay ($10.05 billion); 3. Jeff Skoll, 39, Chairman & Founder, Skoll Foundation ($4.69 billion); 4. Larry Page, 31, President, Products & Co-Founder, Google ($4.19 billion); 5. Sergey Brin, 31, President, Technology & Co-Founder, Google ($4.17 billion); 6. Jerry Yang, 35, Chief Yahoo & Co-Founder, Yahoo ($2.81 billion); 7. David Filo, 38, Chief Yahoo & Co-Founder, Yahoo ($2.57 billion); 8. Ken Griffin, 35, President & Founder, Citadel Investment Group ($1 billion); 9. Dan Snyder, 39, Chairman & Principal Owner, Washington Redskins ($823 million); and 10. Marc Benioff, 39, Chairman & CEO, Salesforce.com ($376 million).