Judge Wesley E. Brown, 103 years young, is the oldest federal judge still hearing cases.

Born June 22, 1907, he got his law degree in 1933, did private practice from 1933 to 1944, entered the US Navy in 1944, becoming a Lieutenant and serving until 1946, and then returned to private practice until 1958.  He was a Referee in Bankruptcy for the United States District Court for the District of Kansas from 1958 to 1962, and then was appointed to the Kansas court.  He served as chief judge from 1971 to 1977, and became the senior judge in 1979.  He still hears cases to this day.

That is an impressive resume!