1. Bill Gates ($67 billion)
Bill Gates started his career by programming computer languages.
In his early 20s, Bill Gates dropped out of Harvard University and decided to open his own software company with a friend, who later became Microsoft co-founder Paul Allen.
2. Elon Musk ($2.7 billion)
Elon is `predestined` to sell his company to large businesses.
Elon Musk graduated with a degree in Economics from the University of Pennsylvania.
3. Larry Ellison (43 billion USD)
Ellison is one of the billionaires who spends a lot on hobbies and collecting luxury items.
At the age of 20, billionaire Larry dropped out of two different universities in Illinois and left for Northern California.
4. Larry Page ($23 billion) and Sergey Brin ($22.8 billion)
Larry Page (left) and Sergey Brin developed the algorithm that created the search engine.
The two co-founders of `search giant` Google met when they were 20 years old.
5. Mark Zuckerberg ($13.3 billion)
Mark Zuckerberg became a billionaire when he was just 23 years old.
Mark was a student at Harvard University before dropping out and becoming one of the youngest billionaires in the world at the age of 23 thanks to the social network he founded while in the dormitory.
6. Michael Dell ($15.3 billion)
CEO of Dell Computer Corporation started his business by selling upgrade kits for computers.
When he was less than 20 years old, Dell knew how to use the money he earned from his part-time job to invest in stocks and precious metals.
7. Steve Ballmer ($15.2 billion)
Steve Ballmer was hand-picked by Bill Gates to join Microsoft when he was just 24 years old.
Steve was a math and economics student at Harvard University at the age of 20. After graduating, Ballmer worked as a product management assistant at Proctor & Gamble company.
8. Steve Jobs
Steve Jobs, like Bill Gates, dropped out of college to choose his own path.
The late Apple CEO worked as a technician at the famous game company Atari when he was 19 years old.
Phuong Linh