How old is too old for trick or treating?

You're never too old!
=]

From 1-17, it's fine.
From 18-29, it's annoying.
From 30 and up, it's creepy.

you can go when you are kid. then go and take your kids.

ur never 2 old 2 go trick or treatin unless ur like 50

You are never to old to trick or treat. Just because you get old doesn't mean there is an expiration date on fun.

Well for me, when theres no costumes that fit you. Okay?! LOL.

Dude, me and my friends plan on running around in banana, hunter, and gorilla suits when we are old on halloween.
You are NEVER to old

I stopped Trick or Treating when I turned 13, but I think once you become a teenager it is time to move on to other things. I'll admit I get a little annoyed at older Trick or Treaters that can afford to get their own candy.

I stopped when I was 12 or 13, but then again I'm shy and don't like taking to strangers. I'd say you should stop trick-or-treating when, for whatever reason, you don't enjoy it anymore.