Linda Blair was 10 in The Way We Live Now when she played the character 'Sara Aldridge'.
That was over 54 years ago in 1970.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 65, and has starred in 65 movies in total, 63 of those since The Way We Live Now was released.
In The Way We Live Now, I think Linda Blair looks: