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.
United States presidential election, 1840
The Whigs did not get to enjoy the benefits of their electoral victory. The 67-year-old Harrison was the oldest U.S. president elected until Ronald Reagan won the 1980 presidential election, and Harrison died a little more than a month after his inauguration. Harrison was succeeded by John Tyler, who proved to be disastrous for the Whigs. While Tyler had been a staunch supporter of Clay at the convention, he was a former Democrat and a passionate supporter of states' rights. As President Tyler blocked the Whigs' domestic legislative agenda, he was expelled from the party.