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Juvenile idiopathic scoliosis is defined by onset during the preadolescent years, specifically between about 3 and 10 years old. This distinguishes it from infantile scoliosis, which occurs under age 3, and adolescent idiopathic scoliosis, which typically begins after age 10 (often 11–18). So the age range that matches juvenile onset is 3–10 years. Understanding these age distinctions helps guide screening and management, since growth and progression risk change with age.