Jimmy Carter's tenure as the 39th president of the United States began with his inauguration on January 20, 1977, and ended on January 20, 1981. Carter, a Democrat from Georgia, took office following his narrow victory over Republican incumbent president Gerald Ford in the 1976 presidential election. His presidency ended following his landslide defeat in the 1980 presidential election to Republican Ronald Reagan, after one term in office. Aged 99, he is the oldest living, longest-lived and longest-married president, and has the longest post-presidency. He is the fourth-oldest living former state leader.

The 1980 United States presidential election was the 49th quadrennial presidential election, held on November 4, 1980. The Republican nominee, former California governor Ronald Reagan, defeated incumbent Democratic President Jimmy Carter in a landslide victory.