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Once puberty is complete, the genitals are usually fully developed. The key stages of development of the genitals for boys: Pubic hair usually grows first, followed by underarm hair after about a year.
Facial hair and other body hair will develop after around 2 years of puberty.
Illnesses, genetic conditions, and use of some medications, such as corticosteroids, can all slow or limit growth. This calculation is approximate and, in general, it is not possible to predict height accurately.Growth does tend to follow a curve, however, so if a person regularly plots a boy's height on a graph throughout their childhood, it may be possible to track where the line is likely to end up.Developing physically into an adult takes 2 to 5 years.Most boys will stop growing taller by age 16 and will usually have developed fully by 18.