Hello, there is no age limit for orthopedic treatment. However, according to the situation of different malocclusion, the treatment has the requirement of the best age. The patients with overbite are malocclusion, and the sooner they are corrected, the better. When the deciduous teeth are 2-3 years old, they can wear movable appliances to correct malocclusion. Delaying to permanent dentition can easily lead to skeletal malocclusion, which needs to be corrected successfully by orthognathic surgery. Non-skeletal malocclusion usually needs to be performed after the replacement of deciduous dentition and permanent dentition. Boys 12- 14 years old and girls 10- 12 years old are the best correction ages.