At 18 years old, O-legs have nothing to do with the ability to grow taller, but rather with the closure of the epiphyses. Whether or not you can grow taller needs to be determined by the degree of epiphyseal closure. Generally, at 18 years old, the epiphyses are close to closing or have already closed, and in the case of those that have already closed, there is no way to grow taller. For those who have already closed their epiphyses, there is no way to grow taller. Some 18-year-olds may not have closed their epiphyses, which suggests that their bone age is small and there is still room for development, so they can strengthen their nutrition, eat more nutrient-rich foods such as high-protein and high-calcium foods, and do more exercise to cultivate a good habit of living. If you are 18 years old, you can take an X-ray examination in the hospital to determine the degree of epiphyseal closure, even if you have O-shaped leg deformity, it is possible to grow taller, of course, for O-shaped leg deformity, it should be standardized under the guidance of the doctor for treatment.