Say you pulled out your Hogwarts robe for your 20 year reunion and found a hair on it. If you used a hair from 10-20 years ago in the Polyjuice Potion would you be a younger version of yourself? Would the potion work at all? Could this be a temporary youth potion?
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Suppose you cut a five year old's hair, save it for 10 years, and then use it for a Polyjuice transformation. What age do you turn into: The toddler or the teenager?
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A spin off of  wherein it's asked whether there are any canon examples of a witch or wizard owning more than one wand for practical reasons. As DVK's question doesn't specify regarding The wand chooses the wizard, I'm going to ask about that particular aspect.   Can a witch or wizard be chosen by more than one wand?  We've seen numerous examples in Harry Potter of individuals using wands that belong(ed) to someone else, or had a new wand made for them with Ollivander1 being under duress (Wormtail), but are there any examples in canon where a person is chosen by more than one wand?   Is a child's first purchase from Ollivander's the one and only time they can be "chosen" by a wand? Or, should they break their wand, want a second wand, or lose their wand, and need a replacement, would they be able to be chosen a second time by a totally new wand?  For reference if interested: ; ; ; ;  [Pottermore/Flickr] ETA:  and   1: I know there are other wandmakers in HP, but I am using Ollivander as my example because he is the best known in the series.
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My main question is about the process of doing spells. If it is explained in the books, I am eager to know what consisted spells except words and waving the wand.    In the Harry Potter series, Hogwarts taught magic to wizards. Now except in Potion-making classes, all they learnt were some spells like "lumos", "stupefy" etc. Now we mostly see a dozen spells mainly used by Harry and teams in the whole series in which they wave their wand and say it, may be with a bit of concentration. Except Expecto Patronum, which including a lot of practice to get hold of your happiest memory, and the apparating process, which can be dangerous (actually it was never taught in school and Hermione just seem to know it somehow), none other spells seems to be tough and can be taught maximum in a week. Were there any technicalities to perform each spell, except waving wand and saying it?
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In Harry Potter and the Philosopher's Stone, Chapter 6, Ron says:     You never get anything new either, with five brothers. I've got Bill's old robes, Charlie's old wand and Percy's old rat.   What I don't understand is why Charlie would give up his wand to get a new one. Since the wand chooses its owner, his original wand was already an excellent fit for him, and I seem to recall that a wand grows in power the longer it is in the possession of its owner.  The most common reason we see for wizards getting a new wand is that the old one is broken. But the wand was perfectly intact when Ron had it (before the Whomping Willow incident anyway). And as far as I can tell, there was nothing else deficient about the wand.  So if Charlie had a perfectly good wand that was already in tune with him and would become better as he continued to use it, why would he give it up and give a different wand?
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Looking at the questions and answer to these two questions.  &amp;  and neither mentions the longevity of magic. I recall several instances of magic failing to last; the money that was spread at the  and the broken  on.  If I recall correctly when Voldemort died, the curses on several people were lifted.  I don't recall if any other spells fell apart with his death.  Is there any canon evidence on the the length of time a spell will live?
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Following on from this question:  Casting True Polymorph on an unwilling creature (relevant parts included only):  You transform the creature into a different creature...or into an object.The transformation lasts for the duration, or until the target drops to O hit points or dies. If you concentrate on this spell for the full hour, the transformation becomes permanent. An unwilling creature can make a Wisdom saving throw, and if it succeeds, it isn't affected by this spell. Creature into Creature: The target assumes the hit points of its new form, and when it reverts to its normal form, the creature returns to the number of hit points it had before it transformed. If it reverts as a result of dropping to O hit points, any excess damage carries over to its normal form. As long as the excess damage doesn't reduce the creature's normal form to O hit points, it isn't knocked unconscious. Creature into Object: If you turn a creature into an object, it transforms along with whatever it is wearing and carrying into that form. The creature's statistics become those of the object, and the creature has no memory of time spent in this form, after the spell ends and it returns to its normal form.  The consensus seems to be that if the creature fails the Wisdom save, you can transform it into a weak creature like a slug or an object like a cup, and can then wait for 61 minutes concentrating on the spell, then stamp on the item and kill it, permanently, because that was its new permanent form. But this seems terribly unbalanced, requiring a single wisdom save to be failed (and these can be influenced with features such as Heightened Spell and Magical Ambush) to kill any creature which can be polymorphed, no matter its stats. This also seems to make True Polymorph a better version of Power Word Kill (if delayed and requiring a save) since it is completely uncapped by health, only by Wisdom save proficiency, as well as including many other functions. This makes it seem unlikely this is the correct interpretation of True Polymorph since it renders another (already weak, for that level) spell almost entirely pointless. I presumed the spell to be saying that after one hour of concentrating on it, the polymorphed form no longer needs to be concentrated on and could last forever, but will still revert back to the original form if reduced to 0 HP, as described in the linked question where the creature (polymorphed into crafting materials) was cut apart. This seems to make much more sense and retains balance. Which interpretation is correct? Does the 'permanent' section overrule the 'transforms back if reduced to 0 hit points' part?
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From a link from the question  to the HP Wikia, I started mulling over something I read about Voldemort and the "regeneration" potion (not a canon potion, but I'll use it for lack of a better way of describing it. . .) and would really like to know:  How did Voldemort drink the regeneration potion to turn his body into the grotesque childlike form we see in Goblet of Fire while he was still in a "mangled spectral state"?  Spectres (i.e. spirits or ghosts) are non-corporeal; they obviously can't consume food or drink liquids. So, how did Voldemort overcome this difficulty and manage to drink the regeneration potion?
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Do we know how long potions (in general, or at least specific ones) are potent (no pun intended) in Harry Potter canon?  E.g. do they last a couple of hours? Minutes? Years?   I seem to vaguely remember some comments of Snape's about Wolfesbane potion therfore I think at least some information exists.
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In the Harry Potter series is it clear that magically-inclined individuals (witches/wizards) will live to be considerably older than their Muggle counterparts? From the question , it is given that Dumbledore was roughly 115 years old when he died, and at that age he hardly seemed ready to kick the bucket naturally.  With that in mind, how old will a wizard typically live to be, barring accidents or murder?
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As anyone who is familiar with Harry Potter knows, a horcrux is made when someone commits murder and stores a piece of their soul in something. Would it be possible for this someone to later recover and reintegrate their soul piece(s), should they want to?
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In Harry Potter, when a witch or a wizard is 11 they go to Hogwarts and their first major experience is their own Sorting. In front of the Great Hall, each new student goes to the stool, sits down, and puts on ye olde Sorting Hat. After anywhere from just a moment to , the hat yells out one of Hufflepuff, Gryffindor, Ravenclaw, or Slytherin. And from then on that student belongs to that house.  But is that really it? Does the Sorting Hat's decision represent the house someone would belong to their whole life? Of course, you can't literally switch from one house to another while you're at school, but in spirit (which is what the Hat is meant to consider), can your house change?  Suppose some witch is sorted into Hufflepuff. More than that, suppose she is a true Hufflepuff, the most loyal, hard-working, and honest kind of person you'd find anywhere. Would it be possible, say fifteen years later, for her to go through some serious event in her life and come out not quite as loyal or hard-working, but so brave, chivalrous, and reckless that she'd suddenly be a true Gryffindor? Sure, she can't be re-Sorted, but if this were possible, then if you were to put the Hat on her it say she should be in Gryffindor.  So can this happen, or is it impossible for someone's character to change such that their house changes? Or, if this were possible, would the Sorting Hat have actually already known that fifteen years later the witch would become a Gryffindor, and so would have Sorted her into Gryffindor from the start?
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‘You are here to learn the subtle science and exact art of potionmaking,’ [Snape] began. He spoke in barely more than a whisper, but they caught every word – like Professor McGonagall, Snape had the gift of keeping a class silent without effort. ‘As there is little foolish wand-waving here, many of you will hardly believe this is magic. I don’t expect you will really understand the beauty of the softly simmering cauldron with its shimmering fumes, the delicate power of liquids that creep through human veins, bewitching the mind, ensnaring the senses ... I can teach you how to bottle fame, brew glory, even stopper death – if you aren’t as big a bunch of dunderheads as I usually have to teach.’&#185;   Philosopher's Stone - page 102 - Bloomsbury - chapter 8, The Potions Master   Are there any canon potions that actually grant fame or glory, or stopper death? I'm looking for specific canon-based answers from sources such as the Harry Potter books, interviews with J.K. Rowling, or information from Pottermore. Maybe because it's early I'm overlooking the obvious, but offhand I can't think of any canon potions that fit this criteria exactly.   &#185;I edited in the entire paragraph that I can teach you how to bottle fame, brew glory, even stopper death comes from for clarity. Hopefully this will be helpful and provide a better context for the comment in question.
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If you are a level 20 Wizard who is True Polymorphed into an Ancient Brass Dragon, can you then use the Dragon's Change Shape ability to turn back into a level 20 Wizard, maintaining all your class abilities, but also gaining the dragon's hit points, and various other statistics listed in the text of Change Shape?
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When Albus Dumbledore  finally reaches the island with Harry Potter and finds out that you can't get near the potion, he made a cup and drank it. Why couldn't he just have poured the potion on the "floor"? Why couldn't he have made a big cup to hold almost everything inside the basin?
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says:     Creature into Creature. If you turn a creature into another kind of creature, the new form can be any kind you choose whose challenge rating is equal to or less than the target’s (or its level, if the target doesn’t have a challenge rating). The target’s game statistics, including mental ability scores, are replaced by the statistics of the new form. It retains its alignment and personality.   I assume it changes the creature's type as well.   says:     Your body falls into a catatonic state as your soul leaves it and enters the container you used for the spell's material component. While your soul inhabits the container, you are aware of your surroundings as if you were in the container's space. You can't move or use reactions. The only action you can take is to project your soul up to 100 feet out of the container, either returning to your living body (and ending the spell) or attempting to possess a humanoid's body.   Question:  Is it possible to true polymorph a non-humanoid creature, wait for an hour to make changes permanent (so one doesn't break concentration), use magic jar, possess target's body and then dispel true polymorph with  thus gaining all the perks of original host's body?   I was shown it might be  and advised to add a little of background information. As for now my PC has decent mental abilities but his physical attributes leave much to be desired so I was looking for a way to improve them (on par with AC and HP pool) without removing ability to cast spells and leaving his mental attributes untouched. Polymorphing into a dragon is still a thing though it does cap at CR20 Ancient Brass Dragon.
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This Q/A (  ) made me realize that I can't seem to remember a single HP wizard/witch who had a Muggle job with a Muggle company, aside from Kingsley's bodyguard cover as the Prime Minister's secretary.  Everyone whom I recall being mentioned as having a job is either employed in some magical company or the Ministry of Magic (which seems to employ more magical people than every other employer combined) or be self-employed - again economically interacting with wizards.  Am I merely forgetting someone, or was Kingsley really the only magically capable person with a paycheck from the Muggle world (which doesn't count since the job was a cover)?  UPDATE: Just to clarify - I didn't necessarily mean "working a Muggle job while using magic to help you" - it could also mean simply doing a Muggle job. So there's not necessarily a concern about Statute of Secrecy (plus, you can use the magic, say, to learn - e.g. Hermione could magick herself to learn how to do dentistry in 1 month or something). So no need to answer how having some wizard doing a Muggle job would be contrary to HP universe rules. I merely want to know if there's an example, NOT why there should't be one.
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In her third year at Hogwarts, Hermione is given a time-turner so she can take more classes. Several of her classes are concurrent to each other, so she attends one class (for 1-2 hours) goes back in time, and attends a different class during the same time frame.  But from an aging point of view, she should age 4 hours in relation to the 2 hours everyone else ages. How much older should Hermione be relative to everyone else after using the time-turner for an entire school year?