Brad Dourif was 39 in The Exorcist III when he played the character 'James Venamun / The Gemini Killer'.
That was over 33 years ago in 1990.
Today he is 73, and has starred in 138 movies in total, 106 of those since The Exorcist III was released.
In The Exorcist III, I think Brad Dourif looks: