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This is a list of United States Presidents by age. This table can be sorted to display United States Presidents by name, order of office, date of birth, age at inauguration, length of retirement, or lifespan. Age at inauguration is determined by the day a president assumed office, not the day of the election. Two measures of longevity are given; this is to allow for the differing number of leap days occurring within the life of each President. The first figure is the number of days between date of birth and date of death, allowing for leap days; in parentheses the same period given in years and days, with the years being the number of whole years that the President lived, and the days being the remaining number of days after his last birthday. Where the president in question is still living, the longevity is calculated up to . ==Overview== The average age of accession is 54 years and 11 months, which falls between Herbert Hoover (22nd) and Lyndon B. Johnson (23rd). The youngest person to assume office was Theodore Roosevelt (age 42), who became president following William McKinley's assassination. The youngest president ''elected'' to office was John F. Kennedy (age 43 years, 236 days), who was also the youngest to leave office (age 46 years and 177 days) when he was assassinated. The oldest president to assume office was Ronald Reagan (age 69 years, 349 days), who was also the oldest in office (age 77 years, 349 days), ending at the inauguration of George H. W. Bush. The oldest living president is George H. W. Bush, born June 12, 1924 (aged ). Jimmy Carter is the second-oldest, 111 days younger than Bush. Carter was born October 1, 1924 (aged ). The youngest living former president is Bill Clinton, born August 19, 1946 (aged ), followed by George W. Bush, 44 days older, born July 6, 1946 (aged ). The youngest living president is the incumbent, Barack Obama, born August 4, 1961 (aged ). The longest-lived president was Gerald Ford, who died at the age of 93 years and 165 days. Ronald Reagan was the second longest-lived, 45 days short of Ford. The oldest living president, George H. W. Bush, will tie Reagan if he lives to October 10, 2017, and tie Ford if he lives to November 24, 2017. The second-oldest living president, Jimmy Carter, will tie Reagan if he lives to January 29, 2018, and tie Ford if he lives to March 15, 2018. The four longest-lived presidents (Ford, Reagan, Bush and Carter) all held the office since 1974. The shortest-lived president was John F. Kennedy, who was assassinated at the age of 46 years and 177 days. The shortest-lived president to die a natural death was James K. Polk, who died of cholera at the age of 53 years and 225 days. The president with the longest retirement is Jimmy Carter, at days and counting. Carter achieved this record on September 8, 2012, surpassing Herbert Hoover, who died 11,553 days after leaving the presidency. Hoover held the record for more than 54 years, from July 5, 1958, when he surpassed John Adams, until September 8, 2012, when Carter surpassed Hoover. Adams, only the second president to retire, had held the record for over 154 years, since December 14, 1803, when he surpassed George Washington. The president with the shortest retirement was James K. Polk, who died 103 days after leaving the presidency. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of Presidents of the United States by age」の詳細全文を読む スポンサード リンク
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