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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.This is triggered by the pituitary gland, which secretes a surge of hormonal agents into the blood stream, initiating a chain reaction to occur.The male and female gonads are subsequently activated, which puts them into a state of rapid growth and development; the triggered gonads now commence the mass production of the necessary chemicals.The end of adolescence and the beginning of adulthood varies by country and by function.Furthermore, even within a single nation state or culture there can be different ages at which an individual is considered (chronologically and legally) 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.
The study of adolescent development often involves interdisciplinary collaborations.
Males experience their growth spurt about two years later, on average, than females.
During their peak height velocity (the time of most rapid growth), adolescents grow at a growth rate nearly identical to that of a toddler—about 4 inches (10.3 cm) a year for males and 3.5 inches (9 cm) for females.
Some boys may develop gynecomastia due to an imbalance of sex hormones, tissue responsiveness or obesity.
As with most human biological processes, this specific order may vary among some individuals.