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 , following William McKinley's assassination; the oldest was Donald Trump, who was old at his inauguration. The youngest person to be elected president was John F. Kennedy, at of age on election day; the oldest was Ronald Reagan, who was old at the time of his election to a second term.
Dayton, Newark
Jonathan Dayton (October 16, 1760October 9, 1824) was an American politician from the U.S. state of New Jersey. He was the youngest person to sign the United States Constitution and a member of the U.S. House of Representatives, serving as the fourth Speaker of the United States House of Representatives, and later the U.S. Senate.