At 18 years old, 172cm, if the epiphyses are not closed, it is possible to grow taller, but if the epiphyses are closed, it may not be possible to grow taller. Whether or not you can grow taller at 18 is closely related to whether or not your epiphyses are closed, which refers to the cartilage between the epiphysis and the metaphysis, and the reason why the human body grows taller is mainly due to the fact that the bone cells are constantly dividing and proliferating, and if the epiphyses have not yet closed when you’re 18 years old, you can usually continue to grow taller. In general, girls will stop growing at the age of 19 to 23, and boys will stop growing at the age of 20 to 25. However, there are some boys or girls who may not grow at the age of 18 due to premature epiphyseal closure caused by fractures, epiphyseal plate cartilage trauma, metaphyseal disease, and nutritional and metabolic disorders. If you want to determine whether you can still grow taller, you need to go to a regular hospital in time to ask a professional doctor for diagnosis.