That was over 56 years ago in 1965.
Today he is 90, and has starred in 150 movies in total, 142 since The Sound of Music was released.
In The Sound of Music, I think Christopher Plummer looks:
The Sound of Music 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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