Jul 12, 2018 Kylie Jenner, the youngest member of what Forbes calls the "Kardashian-Jenner industrial complex," is on track to pass Facebook founder Mark Zuckerberg as the youngest self-made billionaire thanks to her 2-year-old Kylie Cosmetics enterprise. Jenner, who turns 21 in August, appears on the cover of the financial magazine's "America's Women Billionaires" issue. The magazine estimates her worth at $900 million, on par with Jay-Z, the wealthiest man in hip-hop at age 48. (By comparison, they point out, Jenner's half-sister Kim Kardashian West is worth approximately $350 million.) in other words Kylie is worth more than Beyoncé and Kim Kardashian combined.