Kylie Jenner has been named the youngest self-made billionaire of all time by Forbes magazine, thanks to the booming cosmetics company she founded three years ago. 21-year-old Jenner, the half-sister of reality television stars Kim, Khloe and Kourtney Kardashian, made the annual Forbes list of billionaires after debuting her Kylie Cosmetics online in 2015 with $US29 ($41) lip kits containing...