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.
Presidents of the United States on U.S. postage stamps
Abraham Lincoln (February 12, 1809 – April 15, 1865) was the 16th President of the United States, serving from 1861 to 1865. He successfully led the United States through its Civil War, thus preserving the Union and bringing an end to slavery. Lincoln was the first Republican president, elected in 1860. Lincoln issued the Emancipation Proclamation in 1863 and promoted the passage of the Thirteenth Amendment to the Constitution.