Jami Gertz was 14 in On the Right Track when she played the character 'Big Girl'.
That was over 43 years ago in 1981.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 58, and has starred in 27 movies in total, 26 of those since On the Right Track was released.
In On the Right Track, I think Jami Gertz looks: