Elizabeth McGovern was 18 in Ordinary People when she played the character 'Jeannine Pratt'.
That was over 44 years ago in 1980.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 62, and has starred in 59 movies in total, 58 of those since Ordinary People was released.
In Ordinary People, I think Elizabeth McGovern looks: