Martha Plimpton was 9 in Rollover when she played the character 'Fewster's Older Daughter'.
That was over 43 years ago in 1981.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 53, and has starred in 48 movies in total, 47 of those since Rollover was released.
In Rollover, I think Martha Plimpton looks: