Mary Stuart Masterson was 7 in The Stepford Wives when she played the character 'Kim Eberhart'.
That was over 49 years ago in 1975.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 57, and has starred in 42 movies in total, 40 of those since The Stepford Wives was released.
In The Stepford Wives, I think Mary Stuart Masterson looks: