That was over 8 years ago in 2012.
Today he is 52, and has starred in 65 movies in total, 22 since The Avengers was released.
In The Avengers, I think Mark Ruffalo looks:
The Avengers scores 7.5 out of 10 on The Movie Database.
Mark Ruffalo's first acting role was as 'Christian' in Mirror, Mirror II: Raven Dance, released in 1994 when he was 26.
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