who is the youngest us president elected to the office
List of presidents of the United States by age 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 inauguration. The youngest person to assume the office was Theodore Roosevelt, who became president at the age of 42 years, 322 days, following William McKinley's assassination; the oldest was Donald Trump, who was 70 years, 220 days old at his inauguration. The youngest person to be elected president was John F. Kennedy, at 43 years, 163 days of age on election day; the oldest was Ronald Reagan, who was 73 years, 274 days old at the time of his election to a second term.
List of Presidents of the United States by age The median age at accession to the presidency is roughly 55 years and 6 months, which is about how old Benjamin Harrison was at the time of his inauguration. The youngest person to assume the office was Theodore Roosevelt, who became president following William McKinley's assassination, at the age of 7004156620000000000♠42 years, 322 days. The youngest person elected president was John F. Kennedy, who was inaugurated into office at the age of 7004159420000000000♠43 years, 236 days. Assassinated three years into his term, he became the youngest at the time of leaving office (7004169780000000000♠46 years, 177 days); the youngest person at the time of leaving office after serving a full four-year term was Theodore Roosevelt (7004183900000000000♠50 years, 128 days). The oldest person at the time of entering office was Donald Trump, at the age of 7004257880000000000♠70 years, 220 days; Ronald Reagan was the oldest person in office, at the age of 7004284730000000000♠77 years, 349 days when his presidency ended in January 1989.