Youngest Billionaires

of 2013These 29 billionaires are all under 40 years old.

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No. 1: Dustin MoskovitzAge: 28Net Worth: $3.8 billion

Dustin Moskovitz, Mark Zuckerberg's former roommate, no longer works at Facebook, the social networking giant that he co-founded. A signee of Bill Gates' and Warren Buffett's Giving Pledge, Moskovitz bikes to work, flies commercial, and pitches his own tent at Burning Man.

No. 2: Mark ZuckerbergAge: 28Net Worth: $13.3 billion

Few CEOs of any age are under more media scrutiny than Mark Zuckerberg (who's only 8 days older than Moskovitz). Since taking Facebook public in May 2012, and getting married days later, the hoodie-wearing founder has seen his net worth rise and fall with every fluctuation of the stock price.

No. 3: Albert von Thurn und TaxisAge: 29Net Worth: $1.5 billion

Albert von Thurn und Taxis first appeared in Forbes' billionaire rankings at age 8 but officially inherited his fortune in 2001 on his 18th birthday. The eligible bachelor is also a race car driver and tours with a German auto-racing league.

No. 4: Scott DuncanAge: 30Net Worth: $5.1 billion

Scott Duncan is the youngest of the four children who inherited the massive fortune of late energy pipeline entrepreneur Dan Duncan, founder of Enterprise Products Partners. Today the company owns more than 50,000 miles of natural gas, oil, and petrochemical pipelines.

No. 5: Eduardo SaverinAge: 30Net Worth: $2.2 billion

Facebook co-founder Eduardo Saverin renounced his United States citizenship in 2011, news of which broke days before the company's IPO and drew accusations of tax evasion. Saverin, immortalized in The Social Network as Mark Zuckerberg's onetime best friend, settled a lengthy legal battle with Facebook, apparently receiving a 5% stake. A Brazilian citizen, he now resides in Singapore and invests in startups.

No. 6: Huiyan YangAge: 31Net Worth: $5.7 billion

Huiyan Yang, the daughter of the founder of real estate developer Country Garden Holdings, is once again China's richest woman. Her father transferred his stake to the Ohio State grad before the company's IPO in 2007.

No. 7: Fahd HaririAge: 32Net Worth: $1.35 billion

Fahd Hariri is the youngest son of slain Lebanese Prime Minister Rafik Hariri. He graduated from the Ecole Spéciale d'Architecture de Paris in 2004. While still a student, he ran an interior design studio on the outskirts of the city, and sold furniture to clients in Saudi Arabia.

No. 8: Marie Besnier BeauvalotAge: 32Net Worth: $1.5 billion

Marie, along with siblings Emmanuel, 42, and Jean-Michel, 45, inherited French dairy giant Lactalis, producers of popular Président brie among hundreds of other cheese, milk and yogurt brands.

No. 9: Sean ParkerAge: 33Net Worth: $2 billion

Sean Parker is revamping his much hyped start-up, Airtime, with the hopes that the video chat site will have the impact of his other Web companies. At 19, Parker skipped college to disrupt the recording industry with music swapping site Napster. He served as Facebook's first president at age 24.

No. 10: Ayman HaririAge: 34Net Worth: $1.35 billion

Ayman Hariri is the son of slain Lebanese Prime Minister Rafik Hariri. He's involved in running Saudi Oger, one of Saudi Arabia's biggest construction companies, and the source of the Hariri family fortune.

No. 11: Yvonne BauerAge: 35Net Worth: $2.4 billion

Yvonne Bauer owns 85% of her family's publishing empire. She is the fifth generation of the family to run the Bauer Media Group, which was founded in 1875. It publishes 570 magazines in 16 countries.

No. 12: Yoshikazu TanakaAge: 36Net Worth: $1.8 billion

Founder and CEO of social-network game site operator Gree, Yoshikazu Tanaka has faced stiff competition this year from archrival DeNA and a game initiative by NTT DoCoMo, the giant cellphone carrier. To get back on track, Tanaka moved to partner with Yahoo Japan and went on a buying spree.

No. 13: Maxim NogotkovAge: 36Net Worth: $1.3 billion

Maxim Nogotkov got his start selling computer programs while in school and later began selling cordless phones. He dropped out of college in order to have more time to focus on building his business. He later founded cell phone retailer Svyaznoy.

No. 14: Alejandro Santo Domingo DavilaAge: 36Net Worth: $11.7 billion

A Harvard history grad, Alejandro Santo Domingo Davila is the eldest son from his jet-setting beer magnate father's second marriage. Now a managing director at a New York-based investment advisory firm, Alejandro sits on the board of the Metropolitan Museum of Art in New York.

No. 15: Jack DorseyAge: 36Net Worth: $1.1 billion

Jack Dorsey made a name for himself as a cofounder and leader of 140-character microblogging company Twitter, but most of his fortune is derived from his stake in mobile payment company Square. The New York University dropout is a certified masseur known for his eclectic interests, which include, among other things, punk music and clothes.

No. 16: Serra SabanciAge: 37Net Worth: $1.3 billion

Serra Sabanci is the daughter of Ozdemir Sabanci who was assassinated in 1996, and a board member of the large conglomerate Sabanci Holding.

No. 17: Nicholas WoodmanAge: 37Net Worth: $1.3 billion

GoPro founder and CEO Nicholas Woodman built the first camera prototypes in his bedroom with his mom's sewing machine and a drill. GoPro came out with its first camera, a 35-millimeter waterproof film version, in 2004. Today, the camera shoots full video in cinema quality HD, allowing anyone from professional surfer Kelly Slater to amateur snowboarders to capture their adventures.

No. 18: Chase ColemanAge: 37Net Worth: $1.4 billion

The hottest young money manager on the planet, Chase Coleman cooled off a touch in 2012, but his Tiger Global hedge fund extended its impressive winning streak, finishing a third straight year with a net return in excess of 20%.

No. 19: Ryan KavanaughAge: 38Net Worth: $1 billion

Ryan Kavanaugh joins the billionaire ranks for the first time this year thanks to his movie studio, Relativity. Kavanaugh is making money by hitting singles and doubles like the recent Safe Haven, which cost $25 million to make and has grossed more than $50 million at the box office.

No. 20: Andrey VerevskiyAge: 38Net Worth: $1 billion

Andrey Verevskiy started trading in grain when he was 19 and founded Kernel Holding a decade later, growing it into Ukraine's largest sunflower oil producer. Last year, Verevskiy was elected to Ukraine's Parliament. 

No. 21: John ArnoldAge: 38Net Worth: $2.8 billion

John Arnold shocked the hedge fund world in May 2012 when he announced he was calling it a career at age 38. Arnold and his wife Laura, who are signatories of the Giving Pledge, plan to devote much of their time to philanthropy. The couple have already given away more than $1.2 billion.

No. 22: Gary FegelAge: 39Net Worth: $1 billion

Gary Fegel attained billionaire status in May 2011 in the wake of Glencore's IPO. After earning his MBA from the University of St. Gallen, Fegel joined the alumina and aluminum department at the commodities titan in 2001.

No. 23: Kostyantin ZhevagoAge: 39Net Worth: $1.5 billion

Son of a mining engineer, Kostyantin Zhevago took over Poltava Iron Ore, the largest exporter of pellets in CIS, at the age of twenty two, and in 2007 he took his mining company Ferrexpo public. An avid soccer fan, Zhevago owns FC Vorska football.

No 24: Dan GertlerAge: 39Net Worth: $2.2 billion

An emerging face of irresponsible capitalism in Africa, Dan Gertler took his family's fortune in diamonds and invested it in mining assets in the Democratic Republic of Congo. While in his 20s, he became a friend of Joseph Kabila, who then ran the military and is now the DRC's president.

No. 25: Ana Lucia de Mattos Barretto VillelaAge: 39Net Worth: $1.15 billion

Ana Lucia de Mattos Barretto Villela belongs to one of Brazil's oldest and most distinguished banking families. She is one of the largest individual shareholders of a holding company that controls Unibanco Holding S.A., one of Brazil's largest banks.

No. 26: Lee Seo-HyunAge: 39Net Worth: $1 billion

She is the youngest daughter of Samsung Chairman Lee Kun-Hee. A graduate of the Parsons School of Design, she is vice president of the luxury goods and fashion division of Cheil Industries (part of the Samsung Group), as well as a vice president at Cheil Worldwide, Korea's largest advertising firm.

No. 27: Fang WeiAge: 39Net Worth: $1.5 billion

Fang Wei is best known for buying turnaround situations, especially those in the steel industry. Fangda Group now has more than 30,000 employees across more than 10 provinces in China.

No. 28: Sergey BrinAge: 39Net Worth: $22.8 billion

The Google cofounder is now director of special projects at the Mountain View, Calif. search giant, leaving his counterpart Larry Page to handle most day-to-day operations. Brin oversees the company's foray into hardware and futuristic endeavors like driverless cars and augmented reality spectacles known as Google Glass.

No. 29: Larry PageAge: 39Net Worth: $23 billion

Google 's cofounder and CEO since April 2011, Page saw the company through the $50 billion revenue milestone in 2012. The stock rose nearly 30% in the past year, adding more than $4 billion to Page's net worth.