Trick or Treat

Tonight was something! I had to run to the store twice as we ran out of candy within an hour. Apparently 4 bags was not enough. I was wondering however what would be the age limit to go trick or treat? I saw many kids who had to be between 16 - 19 who came alone for free candy! In my opinion this is for the little monsters, personally under 13 in my book. I don't know what I am saying maybe had to much candy myself that I am rambling. I ate like 12 mini boxes of Mike&Ike... now I fee sick. Happy Halloween! Boo!