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.
Are You Smarter than a 5th Grader?
The 20-year-old mayor of Muskogee, Oklahoma, and the youngest mayor in the United States, John Tyler Hammons, appeared on October 24, 2008, winning $25,000 for his charity after missing the question "What's the name of the first American woman to travel to outer space?". Unsure of the correct answer (which is Sally Ride), he "copied" the 5th-grader's answer, which was wrong.