7. Warren Buffett — $87.2 Billion

Warren Buffet is known as the most successful investor in the world and rather than hide his secrets, is the seventh richest man in the world and has written many books to help anyone and everyone become wealthy.

The 90-year-old is still very active. Warren started as a paperboy and made it to the top through grit and hard work. He has his own holding company, Berkshire Hathaway. Famous quote: “We simply attempt to be fearful when others are greedy and to be greedy only when others are fearful.”