Jessica Steen was 14 in Threshold when she played the character 'Tracy Vrain'.
That was over 43 years ago in 1981.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 58, and has starred in 38 movies in total, 35 of those since Threshold was released.
In Threshold, I think Jessica Steen looks: