Zachary Gordon was 7 in Because I Said So when he played the character 'Little Arthur (uncredited)'.
That was over 17 years ago in 2007.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 26, and has starred in 31 movies in total, 30 of those since Because I Said So was released.
In Because I Said So, I think Zachary Gordon looks: