Kinda disappointed but not surprised that so many here think Trick or Treating should be cut off at age 12 or whatever. I love to see teens T or T. They're out having what we used to call "good, clean fun". What's the problem?
People seem to think Trick or Treating is some kind of litmus test for kids. They must be young, cute, dressed in an appropriately cute costume, and say "trick or treat" and also "thank you". Old farts (really) do not realize that some children are non-verbal and not meaning to be rude. Also, very few children MEAN to be rude--if kids forget to say "thank you" on Halloween, it's most likely because they're beside themselves with excitement and off to dash to the next house.
Seriously, and I repeat: if you're going into it thinking, "these dang rude kids better say thanks", keep your light off.
Please.