<P> 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 . </P>
<P> 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 . </P>
who is the youngest person to be elected president
who is the youngest person to be elected president
John F. Kennedy
John F. Kennedy