Vanessa Redgrave was 20 in Behind the Mask when she played the character 'Pamela Benson-Gray'.
That was over 66 years ago in 1958.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 87, and has starred in 142 movies in total, 139 of those since Behind the Mask was released.
In Behind the Mask, I think Vanessa Redgrave looks: