Hello dear,
Height of an individual is determined by Genetics, Environmental & Nutritional factors and
Hormonal factors (most important the
Growth Hormone secreted by
pituitary gland in brain)
An individual stops growing in height after the fusion of the Epiphyses (growth plates) of the long bones, which occurs by the age of 17-21 yrs in males.
So...as your son is 16 yrs old now, there is still chance of an increase in height.
An X ray for
bone age determination can be taken to look for the fusion of epiphyses.
Make sure that he is taking a healthy & balanced diet, exercises regularly & avoids stress.
Protein rich diet like soya, groundnut, pulses, etc should be incorporated in his
diet plan.
One more thing...please do not get influenced by any advertisement or health product which claim to boost your growth hormone & increase height...it may be harmful for his health.
Wishing your son a Good Health.
Take care.