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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.
Facial hair is often present in late adolescence, around ages 17 and 18, but may not appear until significantly later.
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.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.In addition to changes in height, adolescents also experience a significant increase in weight (Marshall, 1978).The weight gained during adolescence constitutes nearly half of one's adult body weight.