But who else made the cut at an age when many of us are still drowning in student debt?
Bankrate took a look at published reports and compiled a list of nine, other than "Zuck," who are younger than 35 and at billionaire status. While some inherited their fortunes, most continue to work hard for their money in various fields.
Here are the top nine in order of wealth:
Evan Spiegel
Age: 24
Worth: Around $1.5 billion
How he made his billions: The CEO and co-founder of Snapchat, a photo-messaging app, turned down a $3 billion cash offer from Facebook in 2013 and now runs a company worth an estimated $10 billion.
Bobby Murphy
Age: 25
Worth: Around $1.5 billion
How he made his billions: This co-founder of photo-messaging app Snapchat -- along with fellow billionaire youngster Evan Spiegel -- is the company`s chief technology officer.
Albert von Thurn und Taxis
Age: 31
Worth: Around $1.5 billion
How he made his billions: A German prince, he inherited his billions on his 18th birthday in 2001. His diversified assets include art, timber and real estate. He remains a bachelor and spends his time racing cars for a German league.
Marie Besnier-Beauvalot
Age: 33
Worth: Around $2.7 billion
How she made her billions: She and her siblings inherited a French dairy company founded by her grandfather. The siblings now own 100 percent of the company and run it together.
Elizabeth Holmes
Age: 30
Worth: Around $4.5 billion
How she made her billions: The richest self-made female billionaire and a newcomer to the Forbes list, Holmes founded a blood-testing company, Theranos, in 2003.
Eduardo Saverin
Age: 32
Worth: Around $4.9 billion
How he made his billions: Coming from a wealthy family, Saverin sued Zuckerberg after co-founding the social site and not being given credit for it. He settled out of court. He still is a part owner of Facebook and also is an angel investor for other companies.
Yang Huiyan
Age: 33
Worth: Around $4.9 billion
How she made her billions: Yang Huiyan`s father, Yeung Kwok Keung, created the high-end Chinese real estate development company Country Garden Group. Prior to the company`s Hong Kong IPO in 2007, Keung transferred his shares to his daughter. She is in charge of the company`s development strategies.
Scott Duncan
Age: 32
Worth: Around $6.2 billion
How he made his billions: Duncan inherited his money from his father, Dan Duncan, who started energy pipeline company Enterprise Products. One of four children, Scott Duncan`s fortune grew by $1 billion last year after company stock rose.
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