Generally speaking, the development of human jaws is completed at about 18 years old. Therefore, before 18 years old, it is possible to change if occlusion or other reasons lead to reverse healing. Therefore, the mandible may continue to enlarge.

/kloc-After 0/8 years old, generally speaking, there will be no change.

The one upstairs is definitely not a specialist, please don't talk nonsense!

Before 18 years old, of course,1-13 years old is ideal and can be corrected with orthoses. As I said just now, the incomplete development of jaw can guide the development of maxilla and control the development of mandible.

Generally speaking, after 18 years old, orthognathic surgery is needed to correct it. This is more troublesome. I suggest you go to an authoritative hospital to see if it is mandibular protrusion or maxillary hypoplasia. This can only be diagnosed by a doctor.