How old is too old for Trick or Treating?

I personally don’t think there is any real age limit as to whether or not you should go out with friends or family to trick-or-treat. I think, for some people, there is a certain stigma against doing it. To some, it may seem “childish” but Halloween is as widely recognized as Christmas, and most, if not all, people celebrate that for life. Besides, who would pass up the opportunity to get free candy all night?