Rose Byrne was 14 in Dallas Doll when she played the character 'Rastus Sommers'.
That was over 29 years ago in 1994.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 44, and has starred in 60 movies in total, 59 of those since Dallas Doll was released.
In Dallas Doll, I think Rose Byrne looks: