Kristin Scott Thomas was 23 in Charly when she played an uncredited character.
That was over 39 years ago in 1985.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 63, and has starred in 90 movies in total, 84 of those since Charly was released.
In Charly, I think Kristin Scott Thomas looks: