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Neither. A high school covers 9th grade (14 years old) through 12th grade (18 years old). A college goes beyond those grades. Harry and his friends are 11 years old. (6th grade, for Americans) years old. They "graduate" when they are 17 years old (8th grade). So they are at Hogwarts from middle school through high school.

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12y ago

What else can I help you with?