Mark Ruffalo was 35 in 13 Going on 30 when he played the character 'Matt "Matty" Flamhaff'.
That was over 20 years ago in 2004.
Today he is 56, and has starred in 84 movies in total, 53 of those since 13 Going on 30 was released.
In 13 Going on 30, I think Mark Ruffalo looks: