U.S. BUSINESS / PHILANTHROPY. Andrew Carnegie (1835 - 1919) around 1905. After retiring in 1901 at the age of 66 as the world's richest man, Andrew Carnegie wanted to become a philanthropist, a person who gives money to good causes. He believed in the "Gospel of Wealth," which meant that wealthy people were morally obligated to give their money back to others in society. "Anything worth having is worth working for."