Coming in second, we have Mark Zuckerberg, the CEO and co-founder of Facebook. Although Mark is only 32 years old, he has already made a fortune thanks to his social networking website. He currently has a net worth of $54.3 billion. Although he excelled in many subjects during high school, and even got into Harvard, he didn’t graduate. He dropped out in order to develop the social networking website during his sophomore year, and judging by how things are going for him now, he surely made the right decision.