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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 milestones 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, and marriage.
Adolescence is usually accompanied by an increased independence allowed by the parents or legal guardians, including less supervision as compared to preadolescence.
Thus age provides only a rough marker of adolescence, and scholars have found it difficult to agree upon a precise definition of adolescence.
The testes primarily release testosterone, and the ovaries predominantly dispense estrogen.
The production of these hormones increases gradually until sexual maturation is met.
Puberty is a period of several years in which rapid physical growth and psychological changes occur, culminating in sexual maturity.
The average age of onset of puberty is at 11 for girls and 12 for boys.
In addition to changes in height, adolescents also experience a significant increase in weight (Marshall, 1978).