http://www.museumofconceptualart.com/accomplished/

At age 27:

Kurt Vonnegut, Jr. dropped out from his job at General Electric to become a full-time writer.

Henry David Thoreau went off for two years to live alone in a cabin at Walden Pond.

Cosmonaut Yuri Gagarin became the first person in space.

Memphis millionaire Frederic W. Smith, whose father built ( Read more... )