First of all, it can be corrected at your age. Although the best age group for orthodontic treatment is teenagers aged 9-13, in theory, as long as your teeth are periodontally healthy, , no matter what your age, you can undergo correction, but the correction time will be relatively longer than that for minors. Adult correction usually takes about one and a half to two years, or it may be longer, depending on the individual tooth reset. It depends on the alveolar bone resorption. Hope this helps.