Kristy Swanson was 15 in Pretty in Pink when she played the character 'Duckette'.
That was over 38 years ago in 1986.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 54, and has starred in 63 movies in total, 62 of those since Pretty in Pink was released.
In Pretty in Pink, I think Kristy Swanson looks: