KaDee Strickland was 22 in Girl, Interrupted when she played the character 'Bonnie Gilcrest'.
That was over 25 years ago in 1999.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 48, and has starred in 21 movies in total, 20 of those since Girl, Interrupted was released.
In Girl, Interrupted, I think KaDee Strickland looks: