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.
Calvin Coolidge
John Calvin Coolidge Jr. was born in Plymouth Notch, Windsor County, Vermont, on July 4, 1872, the only U.S. president to be born on Independence Day. He was the elder of the two children of John Calvin Coolidge Sr. (1845–1926) and Victoria Josephine Moor (1846–1885). Coolidge Senior engaged in many occupations and developed a statewide reputation as a prosperous farmer, storekeeper, and public servant. He held various local offices, including justice of the peace and tax collector and served in the Vermont House of Representatives as well as the Vermont Senate. Coolidge's mother was the daughter of a Plymouth Notch farmer. She was chronically ill and died, perhaps from tuberculosis, when Coolidge was twelve years old. His younger sister, Abigail Grace Coolidge (1875–1890), died at the age of fifteen, probably of appendicitis, when Coolidge was eighteen. Coolidge's father married a Plymouth schoolteacher in 1891, and lived to the age of eighty.