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Kylie Jenner, 21, is the world's youngest billionaire according to Forbes' 2019 rich list. The youngest Kardashian family member is making her fortune from her best-selling cosmetics business. She founded and owns Kylie Cosmetics, the three-year-old beauty business that generated an estimated $360m in sales last year. She reached the milestone earlier than Facebook founder Mark Zuckerberg, who became a billionaire at 23.