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.
Jesse Root Grant (politician)
"Not to be confused with Jesse Root Grant I, father of Ulysses S. Grant"
Jesse Root Grant II (February 6, 1858 – June 8, 1934) was an American politician. He was the youngest son of President Ulysses S. Grant and First Lady Julia Grant. He joined the Democratic Party and quixotically sought the party nomination for President, running against William Jennings Bryan in 1908. In 1925, he wrote a biography of his father.