Even though his net worth is $17.5 billion, Mark Zuckerberg, the founder and CEO of Facebook Inc., still gives presentations in t-shirts and jeans. In 2011, The Economist named the 27-year-old New York native the world's wealthiest person, when adjusted for age. Zuckerberg has control of 56.9 percent of Facebook's total pre-IPO voting power, according to Forbes.
David Paul Morris/Bloomberg/Getty Images
Colombia native and Harvard grad Alejandro Santo Domingo Davila, 35, inherited his late father Julio Mario Santo Domingo Pumarejo's empire, the Santo Domingo Group, and now has a net worth of around $9.5 billion. Domingo's father Julio had served as the Colombian ambassador to China in the early '80s and controlled over 100 companies at the time of his death in October 2011.
Dimitrios Kambouris/FilmMagic/Getty Images
Brothers Malvinder Mohan Singh, 38, and Shivinder Mohan Singh, 35, of India had inherited their family's stake in the major pharmaceutical firm, Ranbaxy Laboratories, after the death of their father, according to Forbes. However, the brothers sold their stake in 2008 and now head the companies Religare and Fortis Healthcare Services. Their net worth is estimated to be around $3.5 billion.
Ramesh Sharma/India Today Group/Getty Images
Dustin Moskovitz, 27, was Mark Zuckerberg's roommate at Harvard and watched the birth of Facebook happen from inside their dorm room. The Gainsville, Fla., native helped co-found the social media giant and now has a net worth of $3.5 billion. He is only eight days younger than Zuckerberg.
Araya Diaz/Getty Images
Napster co-founder Sean Parker, 32, became the first president of Facebook, Inc., after he teamed up with Mark Zuckerberg in 2004 to help bring in investors. His net worth is around $2.1 billion and this Virginia native's next project is to launch Airtime, a social video website, this year.
Eric Piermont/AFP/Getty Images
Brazilian native Eduardo Saverin, 29, one of the co-founders of Facebook, has a net worth around $2 billion. "The Social Network," a biopic about Facbook's beginnings, depicts Saverin being forced out of the company when he and Zuckerberg differ in which direction the social media should go. He eventually filed a lawsuit against Facebook, which was settled out of court and the terms were sealed.
Jason Kempin/Getty Images
Prince Albert von Thurn und Taxis, 28, has been on Forbes' billionaire list since he was 8 years old but officially inherited his wealth in 2001 at the age of 18. The dashing German prince, who is estimated to have a net worth of $1.5 billion, spends his days living in one of his family's castles, Schloss Emmeram, and racing cars for a German auto league.
Florian Seefried/Getty Images
Fahd Hariri, the youngest son of slain Lebanese Prime Minister Rafik Hariri, has a stake in the family businesses, which include construction, banking and media holdings. His other siblings, brothers Bahaa, Saad, and Ayman, sister Hind, and their mother Nazek are all billionaires too. Hariri, 31, lives in Paris, where he runs a furniture design studio, and has a net worth around $1.3 billion.
Thomas Samson/AFP/Getty Images
Much like his brother, Ayman Hariri, the second-youngest son of slain Lebanese Prime Minister Rafik Hariri, has a stake in the family businesses and inherited a major fortune from his late father. His estimated net worth is around $1.3 billion. Hariri, 33, has overseen enormous construction projects, including the King Abdullah Financial District in Saudi Arabia.
Frustrated with sweating through cotton T-shirts, former University of Maryland football player Kevin Plank developed a moisture wicking material that became Under Armour. Now a staple piece for almost any athlete's uniform, Under Armour exploded into in an appeal clothing brand that includes pants, jackets, shoes and gear. Plank, 39, is estimated to have a net worth of $1.1 billion.
John McDonnell/Washington Post/Getty Images
Chase Coleman, 36, is a hedge fund manager who ran 2011's most profitable hedge fund during a time of economic crisis, Business Insider reported. A descendent of Peter Stuyvesant, a Dutch general who helped found what became New York City, Coleman trained at the famed hedge fund shop Tiger Management. He has a net worth estimated at $1.1 billion.
Neilson Barnard/WireImage/Getty Images