He has Sam Rayburn's old seat. Besides Rayburn and Hall only one other Congressman was elected by the district in the last 100 years.
Some former Congressmen still alive are even older than Hall: Harry Flood Byrd, Jr, Mario Biaggi, William Scranton, John Anderson, Lindy Boggs, Bruce Alger, Otis Pike, Don Edwards, Peter Peyser to name a few.
I always had the impression that John Quincy Adams was in the House into his 90s. Actually he died at 80. His father lived to 90.
Christopher Lee is in the new Hobbit movie, and appears to still be going strong at 90.