Who is the youngest person ever appointed to the Supreme Court?
The youngest person ever appointed to the U.S. Supreme Court was Joseph Story.
A native of Massachusetts, Story practiced law and served in the U.S. Congress before he was appointed by President Madison to the Supreme Court in 1812 at the tender age of 32. Later he also became a professor of law at Harvard University and wrote a number of influential legal works, including a commentary on the U.S. Constitution.
The oldest person appointed to the U.S. Supreme Court, by the way, was Horace H. Lurton, who was 65 when President Taft elevated him to the position in 1910.