Mary Steenburgen was 24 in Goin' South when she played the character 'Julia Tate / Moon'.
That was over 46 years ago in 1978.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 71, and has starred in 85 movies in total, 84 of those since Goin' South was released.
In Goin' South, I think Mary Steenburgen looks: