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For example, researchers in neuroscience or bio-behavioral health might focus on pubertal changes in brain structure and its effects on cognition or social relations.

Sociologists interested in adolescence might focus on the acquisition of social roles (e.g., worker or romantic partner) and how this varies across cultures or social conditions.

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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.

Physical growth (particularly in males), and cognitive development can extend into the early twenties.

Thus age provides only a rough marker of adolescence, and scholars have found it difficult to agree upon a precise definition of adolescence.

Males experience their growth spurt about two years later, on average, than females.