For idiopathic scoliosis, the younger the age, the better the spinal flexibility and the better the orthopedic results. However, children under 12 years of age have poor skeletal development, and if posterior fusion is done too early, the results are good at the time of surgery, but as the child develops further, the front of the spine continues to grow and will produce rotation, aggravating the deformity and having a greater impact on height. Therefore, if scoliosis can be better controlled and the deformity is not yet severe, the age of surgery is better after 12 years of age. However, if the lateral kyphosis is severe before the age of 12, surgery should be considered in a timely manner and should not be delayed. In addition, for infantile and early childhood scoliosis, or some special types of scoliosis, separate consideration should be given, and the best time for surgery should not be delayed because of concerns about the effect of surgery on height.