Beverly D'Angelo was 24 in The Sentinel when she played the character 'Sandra'.
That was over 46 years ago in 1977.
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 99 movies in total, 95 of those since The Sentinel was released.
In The Sentinel, I think Beverly D'Angelo looks: