Michelle Trachtenberg was 8 in Melissa when she played the character 'Lena'.
That was over 29 years ago in 1995.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 38, and has starred in 28 movies in total, 27 of those since Melissa was released.
In Melissa, I think Michelle Trachtenberg looks: