who is the youngest person to be elected president
List of Presidents of the United States by age The median age upon accession to the presidency is roughly 55 years and 6 months. This 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 at the age of 7004156620000000000♠42 years, 322 days, following William McKinley's assassination. The youngest person elected president was John F. Kennedy, who was inaugurated into office at the age of 7004159420000000000♠43 years, 236 days. The nation's oldest president-elect was Donald Trump, who was inaugurated into office at the age of 7004257880000000000♠70 years, 220 days. The oldest person to begin a new 4-year term was Ronald Reagan, who was 7004270120000000000♠73 years, 349 days at the time of his second inauguration.