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  2. They usually start a year or two earlier in girls than boys, and it can be normal for some changes to start as early as age 8 for females and age 9 for males. Many girls may start their period at around age 12, on average 2-3 years after the onset of breast development.

  3. Adolescence is the transitional stage from childhood to adulthood that occurs between ages 13 and 19. Learn about the physical and psychological changes, the stages of development, the common mental health issues, and the tips for parents and teens.

  4. There are nearly 1.2 billion adolescents (10-19 years old) worldwide. In some countries, adolescents make up as much as a quarter of the population and the number of adolescents is expected to rise through 2050, particularly in low- and middle-income countries (LMICs) where close to 90% of 10- to 19-year-olds live.

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  5. en.wikipedia.org › wiki › AdolescenceAdolescence - Wikipedia

    Adolescence (from Latin adolescere 'to mature') is a transitional stage of physical and psychological development that generally occurs during the period from puberty to adulthood (typically corresponding to the age of majority).

  6. Jan 17, 2018 · At the start of the 20th century, G Stanley Hall loosely defined adolescence as the developmental period ranging from age 14 to 24 years in his treatise on adolescence. More than 50 years ago, WHO proposed that adolescence spanned from 10 to 20 years of age, noting that although it commenced with puberty, the endpoint was less well defined.

  7. Oct 19, 2020 · Learn about adolescence, a period of physical, neurological, psychological and social changes. Find out how WHO defines and approaches adolescent health and development.

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