Thora Birch was 5 in Purple People Eater when she played the character 'Molly Johnson'.
That was over 35 years ago in 1988.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 42, and has starred in 43 movies in total, 43 of those since Purple People Eater was released.
In Purple People Eater, I think Thora Birch looks: