Mariette Hartley was 21 in Ride the High Country when she played the character 'Elsa Knudsen'.
That was over 62 years ago in 1962.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 83, and has starred in 60 movies in total, 59 of those since Ride the High Country was released.
In Ride the High Country, I think Mariette Hartley looks: