Thomas Mann was 18 in It's Kind of a Funny Story when he played the character 'Aaron Fitzcarraldo'.
That was over 14 years ago in 2010.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 32, and has starred in 34 movies in total, 29 of those since It's Kind of a Funny Story was released.
In It's Kind of a Funny Story, I think Thomas Mann looks: