Jimmy Carter at 100: A century of changes for a president and the world

Already the longest-lived of the 45 men to serve as U.S. president, Jimmy Carter reached the century mark.

The 39th president, who remains under home hospice care, turns 100 on Tuesday, Oct. 1, celebrating in the same south Georgia town where he was born in 1924.

Here are some notable markers for Carter, the nation, and the world over his long life.