Alyssa Milano was 10 in Old Enough when she played the character 'Diane'.
That was over 39 years ago in 1984.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 50, and has starred in 49 movies in total, 47 of those since Old Enough was released.
In Old Enough, I think Alyssa Milano looks: