Warren Buffett

At 95, Warren Buffett is the oldest person on this list by a wide margin, and the one whose fortune was built the slowest and most deliberately — roughly 20% annual returns compounded over six decades, not a single stock spike. Berkshire Hathaway's cash pile topped $325 billion in 2025, money Buffett has been notably reluctant to deploy in a market he's called expensive. He's pledged 99% of his wealth to charity, which makes his roughly $145 billion net worth feel almost like a formality rather than the point.