Forbes has named Germany's 18-year-old Kevin David Lehmann as the world's youngest billionaire with a net worth of $3.3 billion. Kevin's father, Guenther Lehmann, had transferred a 50% stake in his drugstore chain 'dm-drogerie markt' to Kevin when he was 14. The stake remained under trusteeship until Kevin's 18th birthday, which was in September 2020.