Jimmy Carter's post-presidential years

Cuban President Fidel Castro greets Carter after his speech in Havana in 2002. Carter was the first U.S. president in or out of office to visit Cuba under Castro's communist rule.

The Carters wave to marchers in the Plains Peanut Festival parade in Plains, Ga. in 2002.

Carter pitches during an annual softball game between his team of Secret Service agents and graduates of Plains High School in Plains, Ga,. in 2002. The game is part of Plains Peanut Festival.

Carter speaks on the opening night of the Democratic National Convention in Boston in 2004.

Carter waves as he departs the White House after a visit in 2009.

Carter works alongside other volunteers at the Washington, D.C., site of a Habitat for Humanity house in 2010.

President Obama, Carter, first lady Michelle Obama and former president Bill Clinton wave as they leave the 50th anniversary celebration of the March on Washington in front of the Lincoln Memorial in 2013.

Carter talks with reporters at a signing for his new book, "A Call to Action: Women, Religion, Violence and Power," at Women and Children First Bookstore 2014 in Chicago.

Jimmy Carter teaches Sunday school at Maranatha Baptist Church in Plains, Ga., in 2014.

Carter, a member of the Elders group of retired prominent world figures, waves as he arrives for a meeting with Palestinian leader Mahmud Abbas in 2015 in the West Bank city of Ramallah.