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  1. adolescence, transitional phase of growth and development between childhood and adulthood. The World Health Organization (WHO) defines an adolescent as any person between ages 10 and 19. This age range falls within WHO’s definition of young people, which refers to individuals between ages 10 and 24.
    www.britannica.com/science/adolescence
    Generally, a person is considered a teenager from around 13 to 19 years old. This period is marked by significant physical, emotional, and cognitive changes.
    psychology.tips/teenager-ages-range/
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  3. Why teenagers aren't what they used to be - BBC

  4. 'Adolescence now lasts from 10 to 24' - BBC

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