The youngest president elected to office was John F Kennedy, who assumed office at the age of 7009137736720000000♠43 years, 236 days, who was also the youngest to leave office when he was assassinated, at the age of 7009146694240000000♠46 years, 177 days.
https://en.wikipedia.org/wiki/List_of_Presidents_of_the_United_States_by_age
John F. Kennedy becomes the youngest man ever to be elected president of the United States, narrowly beating Republican Vice President Richard Nixon. He was also the first Catholic to become president.The campaign was hard fought and bitter. For the first time, presidential candidates engaged in televised debates. Many observers believed that Kennedy’s poised and charming performance during the four debates made the difference in the final vote.
http://www.history.com/this-day-in-history/john-f-kennedy-elected-president
Kennedy was born May 29, 1917 and became president in 1961 which would have made him 43 when he was sworn in. Barack Obama was born August 4, 1961. If elected he would be 47 years 5 months and 16 days old when he takes office. JFK was born May 29, 1917, making him 43 years 7 months and 22 days old when he took office. Although JFK is the youngest to ever be elected, Teddy Roosevelt, who took over for William McKinley was the youngest President. He was born on October 27, 1858, making him 42 years 10 months and 18 days old when he took office.
https://answers.yahoo.com/question/index?qid=20080327095432AAj7Ltr
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 fewer then Ford. 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 13,056 days.
https://en.wikipedia.org/wiki/List_of_Presidents_of_the_United_States_by_age
I was 14 when JFK was shot and, although old enough to remember it clearly, I could not have understood the complex socio-political circumstances that surrounded his short presidency. The more I've read and learned, the more astonished I am by JFK's personal depth, brilliance, sensitivity, and charisma.
https://www.amazon.com/JFK-President-Betrayed-Morgan-Freeman/dp/B00GUVOK3G
The oldest president to assume office was Ronald Reagan, who was 7009220762800000000♠69 years, 349 days old when he assumed office, and was also the oldest in office 7009246008880000000♠77 years, 349 days, when he left office.
https://en.wikipedia.org/wiki/List_of_Presidents_of_the_United_States_by_age
By J. Chambers HALL OF FAMETOP 10 REVIEWER on April 12, 2014. Format: DVD. I was a senior in high school when JFK was assassinated. November 22, 1963 was a day I will always remember in detail, just as my parents remembered December 7, 1941. JFK: A President Betrayed began with documentation that was declassified in the 1990s about plans that US military leaders had proposed for a preemptive nuclear first strike against the Soviet Union.
https://www.amazon.com/JFK-President-Betrayed-Morgan-Freeman/dp/B00GUVOK3G
Kennedy appeared overwhelmed, first by the catastrophic failure of the Bay of Pigs invasion, then by a blustering Nikita Khrushchev during a summit meeting in Europe, and finally by the construction of the Berlin Wall. And there was also the deteriorating situation in Southeast Asia to consider.
http://www.history.com/this-day-in-history/john-f-kennedy-elected-president
How old were the presidents when they took office? Here they are from youngest to oldest: 42 - 1901-1909 - Theodore Roosevelt 43 - 1961-1963 - John F. Kennedy 46 - 1993-2001 - Bill Clinton 46 - 1869-1877 - Ulysses S. G…rant 47 - 2009-Pres.
http://www.answers.com/Q/How_old_was_Jacqueline_Kennedy_whenJack_took_office
31 yrs old (she is the 3rd youngest first lady in American history) 31 yrs old (she is the 3rd youngest first lady in American history)
http://www.answers.com/Q/How_old_was_Jacqueline_Kennedy_whenJack_took_office
how old was jfk when he took office
John F. Kennedy was 43 years and 236 days old, when he took office. JFK was 43 years and 236 days old when he took office.