Nelson Rolihlahla Mandela was a South African anti-apartheid revolutionary, politician, and philanthropist who became President of South Africa at 74.
Lew Wallace was 53 when he wrote Ben Hur, called "the most influential Christian book of the nineteenth century. He was a lawyer and a Union General in the American Civil War.
Peter Mark Roget is best known for publishing, in 1852, at aged 52, the Thesaurus of English Words and Phrases, which is now known as Roget's Theasurus and has never been out of print!
Francis "Frank" McCourt started writing at 65. He was an Irish-American teacher and writer who won a Pulitzer Prize for his incredible novel "Angela's Ashes" which was later made into a film.
in 1911, Charles Ranlett Flint, 61, formed the Computing-Tabulating-Recoridng Company. In 1924, it was re-branded as International Business Machines (IBM).
Gordon Bowker is an American entrepreneur. He began as a writer and went on to co-found Starbucks, at 51, along with Jerry Baldwin and Zev Siegl.