There are five living presidents, including the current commander-in-chief, President Barack Obama. The other living presidents are George W. Bush, Bill Clinton, George H.W. Bush and Jimmy Carter.
Of the five living presidents, only Clinton and Obama have the distinction of entering the office in their 40s. Carter and the younger Bush entered the White House in their 50s, and the elder Bush took office when he was 64.
The elder Bush is the oldest living former president, but only by a couple of months. Carter is the second-oldest.
Here is a list of all living presidents.
1. Barack Obama
George W. Bush, a Republican, was the 43rd president of the United States and is one of five living presidents.
Bush was born on July 6, 1946, in New Haven, Conn. He was 54-years-old when he was sworn in to his first of two terms in the White House in 2001. He was 62 when he left office eight years later, in 2009.
3. Bill Clinton
Bill Clinton, a Democrat, was the 42nd president of the United States and is one of five living presidents.
Clinton was born on Aug. 19, 1946, in Hope, Arkansas. He was 46 when he took the oath of office in 1993 for his first of two terms in the White House. Clinton was 54 when his second term expired in 2001.
George H.W. Bush, a Republican, was the 41st president of the United States and is among five living presidents.
Bush was born on June 12, 1924, in Milton, Mass. He was 64-years-old when he entered the White House in January 1989. He was 68 when his four-year term expired in 1993.
5. Jimmy Carter
Jimmy Carter, a Democrat, was the 39th president of the United States and is one of five living presidents.
Carter was born on Oct. 1, 1924, in Plains, Georgia. He was 52-years-old when he took office in 1977, and 56 years-old when he left the White House four years later, in 1981.