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Millionaire Moguls
Ashley and Mary-Kate Olsen
Few people become millionaires at the age of 10—but then again, most people don't begin working at infancy. The Olsen twin craze began when Mary-Kate and Ashley were just 9 months old, appearing as the cute baby Michelle on the television show Full House. With a pocketful of adorable catchphrases like "You got it, dude," audiences fell in love with the wholesome duo. At just 7 years old, the mini-moguls co-founded Dualstar to market their images to tweens around the world—from DVDs to cosmetics to furniture. At 18, the girls took over the company, estimated to be worth millions.

Now, Mary-Kate and Ashley are all grown up and have discovered a passion for fashion. In 2006, they launched a high-end clothing line called The Row, followed by a more contemporary line, Elizabeth and James. The twins are considered fashion icons and are highly respected by legendary designers for their bold personal styles. "We're like anyone else, but I think we work very hard every single day," Mary-Kate says. But with so much success at only 22 years old, the twins recognize that they aren't exactly like everyone else. "We had a head start," Ashley says.