Whether or not a 17-year-old boy can still grow taller depends on whether or not his epiphyses are closed. If the epiphyses have not yet closed, there is still a possibility for him to grow taller, but if the epiphyses have already closed, he can’t grow taller.
The epiphysis is also called the growth plate, the child grows taller through the growth plate to realize, the boy is 17 years old, if the epiphyseal cartilage has not yet completely ossified, the growth plate has not yet closed, can still grow taller, but because 17 years old is already in the end of puberty, so the potential to grow taller is limited, it may not be able to reach the level of 6cm or more per year, probably can only grow 2~3cm taller.
If a boy is 17 years old, the growth plate has completely ossified and closed, and the epiphyseal cartilage is completely ossified, then there is no possibility of growing taller. Adolescent children to grow taller, it is best to seize the age of 14 to 16 years old, more physical exercise, balanced nutrition, early to bed and early to rise.