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  2. Age and female fertility - Wikipedia

    en.wikipedia.org/wiki/Age_and_female_fertility

    The average age of a girl's first period is 12 to 13 (12.5 years in the United States, [6] 12.72 in Canada, [7] 12.9 in the UK [8]) but, in postmenarchal girls, about 80% of the cycles are anovulatory in the first year after menarche, which declines to 50% in the third year, and to 10% by the sixth. [9]

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  4. Child development stages - Wikipedia

    en.wikipedia.org/wiki/Child_development_stages

    4 years Goes both up and down stairs using one footstep per stairstep ... Typically grows between 0.5 and 0.75 inches (1.3 and 1.9 cm) and gains between 1 and 1.25 ...

  5. Young adult - Wikipedia

    en.wikipedia.org/wiki/Young_adult

    In medicine and the social sciences, a young adult is generally a person in the years following adolescence, sometimes with some overlap. [1] Definitions and opinions on what qualifies as a young adult vary, with works such as Erik Erikson's stages of human development significantly influencing the definition of the term; generally, the term is often used to refer to adults in approximately ...

  6. List of countries by age structure - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_age...

    The population is divided into three groups: Ages 0 to 14 years: children. ... 10.45% Saint Pierre and ... 15.30% 66.25% 18.45%

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