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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2I don't think it's a dupe (not accepted, for starters), but it's worth looking at this answer on What would happen if you used the hair of a metamorphmagus in Polyjuice potion?: Polyjuice clearly copies the current appearance of a person - for example, fake Moody copied the injuries, including the missing eye, of a real one. Haircuts are copied as-is (despite hair growing in all wizards as a dynamic thing). Harry's scar was copied in Battle of Seven Potters. – Jenayah Aug 24 '18 at 14:34