Maura Tierney was 21 in Student Exchange when she played the character 'Kathy Maltby'.
That was over 36 years ago in 1987.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 59, and has starred in 32 movies in total, 31 of those since Student Exchange was released.
In Student Exchange, I think Maura Tierney looks: