Seth Green was 8 in A Billion for Boris when he played the character 'Benjamin "Ape-Face" Andrews'.
That was over 40 years ago in 1984.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 50, and has starred in 107 movies in total, 103 of those since A Billion for Boris was released.
In A Billion for Boris, I think Seth Green looks: