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.
List of Presidents of the United States with facial hair
John Quincy Adams (1825–29) was the first U.S. President to have notable facial hair, with long sideburns. But the first major departure from the tradition of smooth-faced chief executives was Abraham Lincoln (1861–65), who was supposedly (and famously) influenced by 11-year-old Grace Bedell to start growing a beard shortly before he was elected. After Lincoln, all but two presidents over the next 48 years sported facial hair, the exceptions being Andrew Johnson (1865–69) and William McKinley (1897–1901).