Conrad Bain is ALIVE. Conrad Bain was Mr. Drummond on Diff’rent Strokes when the show ran from 1978-1986. He was born February 4, 1923, and is 87 years old right now.
He first appeared on regular television when he played a stuffy next-door neighbor Dr. Arthur Harmon on the show Maude from 1974-1978. Then he had his iconic role as Mr. Drummond. His last regular role was as presidential aide Charley Ross on the George C. Scott show Mr. President in 1987.
According to imdb, here is Conrad Bain’s last television appearance, which is from The Fresh Prince of Bel Air: