Better late than never, I don’t know if you’ll see this. He started investing well before people started giving him money. Like, decades.
Wikipedia page on Buffett:
At 11, he bought three shares of Cities Service Preferred for himself, and three for his sister Doris Buffett (who also became a philanthropist).[20][21][22] At 15, Warren made more than $175 monthly (equivalent to $3,057 in 2024) delivering Washington Post newspapers. In high school, he invested in a business owned by his father and bought a 40-acre farm worked by a tenant farmer.[23] He bought the land when he was 14 years old with $1,200 (equivalent to $21,434 in 2024) of his savings.[23] By the time he graduated from college, Buffett had amassed $9,800 in savings (equivalent to $129,511 in 2024).[18]