Barbara Hershey was 19 in With Six You Get Eggroll when she played the character 'Stacy Iverson'.
That was over 56 years ago in 1968.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 76, and has starred in 88 movies in total, 86 of those since With Six You Get Eggroll was released.
In With Six You Get Eggroll, I think Barbara Hershey looks: