18. Nick Woodman
Age: 39
Net worth: $2.5 billion
Nick Woodman is the founder and CEO of sports-camera company GoPro. With an estimated compensation of $284.5 million, he was the highest-paid U.S. CEO of 2014.
17. Jan Koum
Age: 39
Net worth: $6.8 billion
Jan Koum is the cofounder and CEO of WhatsApp, which Facebook bought for $19 billion in February 2014.
16. Yoshikazu Tanaka
Age: 38
Net worth: $1.14 billion
Yoshikazu Tanaka is the founder and CEO of Gree, a Japanese gaming and social networking company.
15. Jack Dorsey
Age: 38
Net worth: $2.5 billion
Jack Dorsey is a cofounder of Twitter and still owns a 4% stake in the company. He went on to found Square, a mobile payments company.
14. Travis Kalanick
Age: 38
Net worth: $5.3 billion
Travis Kalanick is the cofounder and CEO of Uber. The ridesharing app has been valued at as much as $41 billion, and he's been a billionaire on paper since June 2014.
13. Naruatsu Baba
Age: 37
Net worth: $1.64 billion
Naruatsu Baba is the founder and CEO of Japanese smartphone game maker Colopl.
12. Robert Pera
Age: 37
Net worth: $1.8 billion
Robert Pera founded wireless product maker Ubiquiti Networks. The company's 2011 IPO made him a billionaire.
11. Garrett Camp
Age: 36
Net worth: $5.3 billion
Garret Camp is the cofounder and chairman of Uber. Before that, he cofounded StumbleUpon.
10. Scott Farquhar
Age: 35
Net worth: $1.1 billion
Along with college friend Mike Cannon-Brookes, Scott Farquhar is the cofounder of Australian software company Atlassian. The company is worth $3.3 billion as of April 2014, and Farquhar and Cannon-Brookes each own about a third.
9. Mike Cannon-Brookes
Age: 35
Net worth: $1.1 billion
Mike Cannon-Brookes cofounded Atlassian with college friend Scott Farquhar. According to Forbes, he owns a Tesla.
8. Sean Parker
Age: 35
Net worth: $2.5 billion
Sean Parker is the cofounder of Napster and founding president of Facebook.
7. Eduardo Saverin
Age: 33
Net worth: $4.9 billion
Eduardo Saverin is a cofounder of Facebook. He has since renounced his U.S. citizenship, moved to Singapore, and invested in startups like Hampton Creek and Silvercar.
6. Drew Houston
Age: 32
Net worth: $1.2 billion
Drew Houston is the cofounder and CEO of Dropbox. The company is now worth more than $10 billion.
5. Ryan Graves
Age: 31
Net worth: $1.4 billion
Ryan Graves was Uber's first hire. He got the job by tweeting at Travis Kalanick: ""heres a tip. email me :)."
4. Dustin Moskovitz
Age: 30
Net worth: $8.1 billion
Dustin Moskovitz was Facebook's third employee. He went on to found software firm Asana and, with his wife Cari, Good Ventures.
3. Mark Zuckerberg
Age: 30
Net worth: $34.4 billion
Facebook cofounder and CEO Mark Zuckerberg has been a paper billionaire since he was 23. It became official in 2012, when he sold 30.2 million Facebook shares for a $1.13 billion profit.
2. Bobby Murphy
Age: 26
Net worth: $1.5 billion
Like his cofounder, Snapchat CTO Bobby Murphy owns at least a 15% stake in the disappearing photo messaging startup.
1. Evan Spiegel
Age: 24
Net worth: $1.5 billion
Snapchat cofounder and CEO Evan Spiegel is the youngest billionaire in the world.
"I am a young, white, educated male," he once said at a conference. "I got really, really lucky. And life isn't fair."
