Zhou Qunfei, 47, is the youngest self-made female billionaire, according to Forbes. She leads Lens Technology, which manufactures phone glass covers for Apple and Samsung. Qunfei grew up in a small village in central China, where she raised pigs and ducks to support her family. By 16, she dropped out of high school to work at a factory making watch lenses for about $1 a day. Qunfei At 22, she invested her earnings of $3,000 to start a competitor watch lenses workshop with relatives. Her business boomed when she began to create screens for mobile phones. Motorola was her first major client. Her company has grown tremendously and now employs over 74,000 people in 32 factories with seven locations.