Ruta Lee was 17 in Seven Brides for Seven Brothers when she played the character 'Bride Ruth Jensen'.
That was over 70 years ago in 1954.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 88, and has starred in 28 movies in total, 27 of those since Seven Brides for Seven Brothers was released.
In Seven Brides for Seven Brothers, I think Ruta Lee looks: