David Krumholtz was 32 in Mr. Popper's Penguins when he played the character 'Kent'.
That was over 13 years ago in 2011.
Today he is 46, and has starred in 53 movies in total, 19 of those since Mr. Popper's Penguins was released.
In Mr. Popper's Penguins, I think David Krumholtz looks: