Gretchen Corbett was 21 in Out of It when she played the character 'Barbara'.
That was over 55 years ago in 1969.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 76, and has starred in 22 movies in total, 21 of those since Out of It was released.
In Out of It, I think Gretchen Corbett looks: