The average term for a Supreme Court Justice is 15 years and 16 is the longest recorded.
for life
The first woman to be appointed to the U.S. Supreme Court was Sandra Day O'Connor. She was officially sworn in and took her seat on September 25, 1981.
No. There are no constitutional age, residency, citizenship, or educational requirements for justices of the US Supreme Court. In practice, however, most nominees are in their late 40s, 50s, or (sometimes) early 60s, so they've had time to develop professionally but can still contribute to the court for several decades. The youngest justice appointed to the US Supreme Court was Joseph Story, who was 32 years old when he was seated in 1812.
for life
No. Seven Justices are appointed by the Governor to serve on the Arizona Supreme Court for a regular term of six years.
Justice William O. Douglas was 41 years old when President Roosevelt appointed him to the US Supreme Court in April 1939. Douglas served the longest tenure of any other justice in the Court's history, 36 years, 209 days, and was just one month past his 77th birthday when he retired.
Chief Justice John Marshall was only 45 years old when President Adams appointed him to the US Supreme Court in 1801. Marshall served on the Court until his death in 1835, making him not only the youngest, but the longest-serving Chief Justice in US history.
8 years
An Illinois supreme court justice serves a length of ten years.
President John Adams appointed Chief Justice Marshall to the Supreme Court in 1801 to succeed Oliver Ellsworth, who retired due to ill health. Marshall presided over the Court until his death in 1835, a little more than 34 years. He had the longest tenure as Chief Justice in the history of the Court.
President Harry Truman appointed Tom C. Clark to the US Supreme Court in 1949 to replace Justice Frank Murphy, who died in office. Justice Clark served for 28 years, and retired from the bench on June 12, 1967, to avoid a potential conflict of interest after his son, Ramsey Clark, was appointed US Attorney General. Clark was succeeded by Justice Thurgood Marshall.
490 years
john marshall was the supreme court chief justice for 34 not 35.