Allison Mack was 5 in Police Academy 6: City Under Siege when she played the character 'Little Girl'.
That was over 35 years ago in 1989.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 41, and has starred in 22 movies in total, 21 of those since Police Academy 6: City Under Siege was released.
In Police Academy 6: City Under Siege, I think Allison Mack looks: