Charlie Plummer was 12 in Alan Smithee when he played the character 'T.J.'.
That was over 12 years ago in 2012.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 24, and has starred in 20 movies in total, 16 of those since Alan Smithee was released.
In Alan Smithee, I think Charlie Plummer looks: