10. Lukas Walton, 32
We are starting with the eldest among the top 10 youngest billionaires. He became a billionaire after the passing of his father in 2005, inheriting his wealth and assets. Lukas Walton is actually the grandson of Sam Walton; does that name sound familiar? Well, it is because he’s the founder of Walmart! His inheritance included receiving 1/3rd of his father’s estate and aside from that, he has shares in various entities such as Walmart, First Solar, and Arvest Bank.