I stopped Trick অথবা Treating when I turned 13, but I think once আপনি become a teenager it is time to সরানো on to other things. I'll admit I get a little annoyed at older Trick অথবা Treaters that can afford to get their own candy.
I stopped when I was 12 অথবা 13, but then again I'm shy and don't like taking to strangers. I'd say আপনি should stop trick-or-treating when, for whatever reason, আপনি don't enjoy it anymore.