Adolescence begins with the onset of physiologically normal puberty, and ends when an adult identity and behaviour are accepted. This period of development corresponds roughly to the period between the ages of 10 and 19 years, which is consistent with the World Health Organization's definition of adolescence.
How long does adolescence last in boys?
Adolescence now lasts from the ages of 10 to 24, although it used to be thought to end at 19, scientists say. Young people continuing their education for longer, as well as delayed marriage and parenthood, has pushed back popular perceptions of when adulthood begins.
What are the 5 stages of adolescence?
Around 13-15 years\n\n Some young men will grow more body hair into their early 20s. The hormone testosterone is produced, which stimulates the testes to produce sperm. Your child might start having erections and ejaculating (releasing sperm). During this period, erections often happen for no reason at all.