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Facial hair is often present in late adolescence, around ages 17 and 18, but may not appear until significantly later.Consequently, girls who have a high-fat diet and who are not physically active begin menstruating earlier, on average, than girls whose diet contains less fat and whose activities involve fat reducing exercise (e.g. They have the advantage in capturing the attention of potential partners and in becoming hand-picked for sports.The testes primarily release testosterone, and the ovaries predominantly dispense estrogen.The production of these hormones increases gradually until sexual maturation is met.A thorough understanding of adolescence in society depends on information from various perspectives, including psychology, biology, history, sociology, education, and anthropology.
Furthermore, even within a single nation state or culture there can be different ages at which an individual is considered mature enough for society to entrust them with certain privileges and responsibilities.Puberty occurs through a long process and begins with a surge in hormone production, which in turn causes a number of physical changes.It is the stage of life characterized by the appearance and development of secondary sex characteristics (for example, a deeper voice and larger adam's apple in boys, and development of breasts and more curved and prominent hips in girls) and a strong shift in hormonal balance towards an adult state.This non-uniform growth is one reason why an adolescent body may seem out of proportion.During puberty, bones become harder and more brittle.
Such privileges and responsibilities include driving a vehicle, having legal sexual relations, serving in the armed forces or on a jury, purchasing and drinking alcohol, voting, entering into contracts, finishing certain levels of education, marriage, and accountability for upholding the law.