Christopher Mintz-Plasse was 23 in How to Train Your Dragon 2 when he played the character 'Fishlegs (voice)'.
That was over 10 years ago in 2014.
Today he is 34, and has starred in 34 movies in total, 12 of those since How to Train Your Dragon 2 was released.
In How to Train Your Dragon 2, I think Christopher Mintz-Plasse looks: