Specifically, I'm thinking of the Deathly Hallows and their age. I have a vague memory of either Ron or Hermione commenting on it being unusual that Harry's Invisibility Cloak has worked so well for so long, that the magic normally fizzles out after a few years, once the heard the story about the Deathly Hallows. What I don't remember was how specific it was to that type of magic. Should the magic used in creating it have worn off over time? Offhand, all I can think of that couldn't have been renewed regularly are the horcruxes and their protections - which may have just been powered by the piece of soul in them. If it should have worn off, did (at least one of) the creators of it figure out how to make the magic permanent, like the Deathly Hallows are? Answer There seem to be two sides to this coin, there are some examples of magic wearing out after a period of time, and several examples of magic not wearing out after a period of time. The Marauder's Map seems ...