Rihanna is the youngest billionaire on the planet is German heir Kevin David Lehmann, who is just 18. His father, Guenther Lehmann, transferred a stake in German drugstore chain drogerie markt to his son when he was 14, but it remained under a trusteeship until his 18th birthday, which was in September 2020. Not surprisingly, he is one of just a handful of billionaires to ever debut in the ranks while still a teenager. Others have included Norwegian heiress Alexandra Andresen, who made her debut at age 19 in 2016 and still ranks among the world’s youngest, and German Albert von Thurn und Taxis, the 12th prince in his family line, who officially inherited his fortune on his 18th birthday but later fell from the ranks following the 2008 financial crisis.