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

Jimmy Carter, the longest-lived U.S. president, reaches the century mark on October 1st.. Born in 1924, Carter has witnessed the U.S. population nearly triple in his lifetime.. The 39th president, now in home hospice care, will celebrate his 100th birthday in Plains, Georgia.. From 114 million in 1924 to 330 million today, Carter has seen monumental population growth.