Question: who is the oldest sitting supreme court justice
Answer: Marshall 000000001991 - 10 - 15 - 0000 October 15 , 1991 ( 52 -- 48 ) 000000001991 - 10 - 23 - 0000 October 23 , 1991 -- Incumbent 7003967100000000000 ♠ 26 years , 174 days 107 Ruth Bader Ginsburg ( born 1933 ) NY 112 ! Associate Justice B.