Kathleen Quinlan was 17 in American Graffiti when she played the character 'Peg'.
That was over 51 years ago in 1973.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 69, and has starred in 74 movies in total, 73 of those since American Graffiti was released.
In American Graffiti, I think Kathleen Quinlan looks: