That was over 25 years ago in 1995.
Today he is 91, and has starred in 150 movies in total, 73 since Twelve Monkeys was released.
In Twelve Monkeys, I think Christopher Plummer looks:
Twelve Monkeys scores 7.5 out of 10 on The Movie Database.
Christopher Plummer's first acting role was as 'Walt Murdock' in Wind Across the Everglades, released in 1958 when he was 28.
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