New Jersey: According to Forbes billionaire list, Kylie Jenner becomes the world’s youngest billionaire at age of 21.
The previous record of youngest self-made billionaire was held by the Facebook co-founder Mark Zuckerberg aged 23.

According to Forbes Kylie Jenner owns Kylie cosmetics, which she founded three years ago. Last year Kylie cosmetics generated an estimated $360m in sales.
Here is the list of Forbes top ten billionaires
