Ralph Macchio was 17 in Up the Academy when he played the character 'Chooch Bombalazzi'.
That was over 44 years ago in 1980.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 62, and has starred in 37 movies in total, 36 of those since Up the Academy was released.
In Up the Academy, I think Ralph Macchio looks: