The richest 400 Americans are significantly richer in 2013 than they were last year and younger Americans are accumulating wealth at a faster clip than their baby boomer counterparts, according to two reports released Monday.
The annual Forbes 400 wealthiest Americans list showed that total wealth climbed 19 percent in the last year to $2.02 trillion, up from $1.7 trillion, with an average net worth per individual of $5 billion, up from $ 4.2 billion in 2012. It now takes $1.3 billion in assets just to get on the list.
Atop the list for another year was Bill Gates, who at 57 has a net worth of $72 billion. He was followed by Warren Buffett, who despite giving away about $1 billion last year, was the biggest gainer, adding $12.5 billion to bring his fortune to $58.5 billion.
The average age was 66, according to Forbes senior editor Kerry Dolan. Only 32 of those selected were 48 or younger, fitting them into Generation X or Generation Y, while the rest of the list were baby boomers. Many of the younger billionaires are household names who made their fortunes in the tech industry—Facebook's Mark Zuckerberg (20), computer maker Michael Dell (25), Yahoo's Jerry Yang (327), Tesla Motor's Elon Musk (61), and Google's Larry Page and Sergey Brin (13 and 14).
(Read more: What is 'wealthy'? $5 million and plenty of cash)