Shawn Levy was 17 in Miles to Go… when he played the character 'Greg'.
That was over 38 years ago in 1986.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 55, and has starred in 16 movies in total, 15 of those since Miles to Go… was released.
In Miles to Go…, I think Shawn Levy looks: