In honor of Warren Buffet's 87th birthday, here are 6 things you probably didn't know about the magnate. He bought his first stock when he was 11 years old. Buffett made $62.7 billion of his $77.6 billion net worth after his 50th birthday. He was rejected from Harvard Business School. Buffett has donated a lifetime total of $27 billion. Buffett’s secret to staying young? Coca-Cola and ice cream. He uses a Nokia flip phone, and has lived in the same house since 1958.