This is a list of presidents of the United States by age. The first table charts the age of each United States president at the time of presidential inauguration, upon leaving office, and at the time of death. Where the president is still living, their lifespan is calculated up to. The second table includes those presidents who had the distinction among their peers of being the oldest living president, and charts both when they became and ceased to be the oldest living.
Age of presidents
The median age upon accession to the presidency is 55 years and 3 months. This is how old Lyndon B. Johnson was at the time of his first inauguration. The youngest person to assume the presidency was Theodore Roosevelt, who, at the age of, succeeded to the office after the assassination of William McKinley. The youngest to become president by election was John F. Kennedy, who was, at his inauguration. The oldest person to assume the presidency was Donald Trump, at the age of, on Inauguration Day. Assassinated during his third year in office, John F. Kennedy was the youngest at the time of his departure from office ; the youngest president to leave office at the conclusion of a normal transition was Theodore Roosevelt. The oldest at the time of leaving office was Ronald Reagan. The president born after the greatest number of his successors is John F. Kennedy. He was born after four of his successors: Lyndon B. Johnson ; Ronald Reagan ; Richard Nixon ; and Gerald Ford. On the other extreme, Ronald Reagan was born before four of his predecessors: Richard Nixon ; Gerald Ford ; John F. Kennedy ; and Jimmy Carter. The oldest living president is Jimmy Carter, born October 1, 1924, who is aged. On March 22, 2019, he also became the nation's longest-lived president, surpassing the lifespan of George H. W. Bush, who died at the age of. Additionally, Carter has had the longest post-presidency, now lasting. The youngest living president is Barack Obama, born August 4, 1961. The shortest-lived president who died of natural causes was James K. Polk, who died of cholera at the age of —103 days after he left office. Six presidents have lived into their 90s. The first to do so, John Adams, was the longest-lived president for nearly two centuries, from 1803 until Ronald Reagan surpassed his lifespan, in October 2001. The six presidents, arranged by lifespan:
Presidential age-related data
Oldest living
Of the 44 people who have served as president, 24 have become the oldest such individual of their time, with one, William Howard Taft, doing so twice. Herbert Hoover held the distinction for the longest period of any, from the death of Calvin Coolidge in January 1933 until his own death 31 years later. Lyndon B. Johnson held it for the shortest, from the death of Harry S. Truman in December 1972 until his own death only 27 days later. Theodore Roosevelt, at age 49, is the youngest individual to become the oldest living president; Jimmy Carter became the oldest to acquire the distinction at age 94. On three occasions the oldest living president lost the distinction not by his death, but by the inauguration of a president who was older: Theodore Roosevelt to William Howard Taft in 1909; Taft to Woodrow Wilson in 1913 ; and Richard Nixon to Ronald Reagan in 1981. Eleven presidents have held the distinction while in office. In the cases of George Washington, William Howard Taft, Woodrow Wilson, and Ronald Reagan this occurred upon their inauguration as they were older than their living predecessors. In the cases of John Adams, Ulysses S. Grant, Theodore Roosevelt, Herbert Hoover and Richard Nixon, this happened at the same time as their becoming the only living president; in the cases of Andrew Jackson and Benjamin Harrison, the only other living president at the time was a younger predecessor, John Quincy Adams and Grover Cleveland respectively. By contrast, the president who acquired the distinction furthest from his time in office was Jimmy Carter, who had been retired for when he became the oldest living president, upon the death of George H. W. Bush.
