JoBeth Williams was 28 in The World Beyond when she played the character 'Marian Faber'.
That was over 46 years ago in 1978.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 75, and has starred in 67 movies in total, 66 of those since The World Beyond was released.
In The World Beyond, I think JoBeth Williams looks: