Elizabeth Berkley was 13 in Frog when she played the character 'Kathy'.
That was over 37 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 51, and has starred in 34 movies in total, 33 of those since Frog was released.
In Frog, I think Elizabeth Berkley looks: