Sarah Silverman was 18 in Caesar's Salad when she played an uncredited character.
That was over 34 years ago in 1990.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 53, and has starred in 102 movies in total, 99 of those since Caesar's Salad was released.
In Caesar's Salad, I think Sarah Silverman looks: