Boys may still grow taller at 18, but exactly how much is uncertain.
Boys height growth is continuous, in addition to infancy is the best age to grow taller, generally in the age of 13 to 18 years old puberty when the child will also be more rapid growth and development, in the boy 18 years old usually still grow taller, but the specific depends on whether the epiphysis is closed.
If the epiphysis is not completely closed after the age of 18, there is still room to grow taller, but the specific height can not be determined, it may be a few centimeters or more than a dozen centimeters.
If a boy’s epiphyses have completely closed by age 18, he will not be able to grow any further.
If the boy still has room to grow taller, in order to promote the growth of taller, the diet must increase nutrition, such as drinking milk, etc., to ensure that the protein, calcium intake; usually also do more physical exercise, such as basketball, jumping and so on; but also to ensure that outdoor activities time.