Who did Forbes name the youngest “self made billionaire ever” in 2019?

Forbes later revoked that title when they determined that Kylie had forged her tax return documents, and exaggerated claims about her net worth. They later realized her business was significantly smaller, and less profitable, than the family had spent years leading the cosmetics industry and media outlets, including Forbes, to believe. It’s also widely debated whether she can be considered “self made” as it is believed her mother contributed to her finances including investments into her business, although the family claims she did not.