20 years old! I feel old. "Harry Potter turns 20 today. (Technically, because of how the publishing world works, Harry Potter and the Sorcerer’s Stone turns 20 next year, on September 1, when the US version came out.) Pottermania is so well-entrenched that all you need to see is a red and gold scarf to instantly know a lot about the person wearing it. Hogwarts is the preeminent fictional school."