HUMAN DEVELOPMENT (BIOLOGY)

★ ''Child''

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★ Neonate (newborn) (0-30 days)

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★ Infant (baby) (1 month-1 year)

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★ Toddler (1-4)

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★ Primary school age (also called 'prepubescence') (4-10)

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★ Elementary school age (also called 'middle childhood') (4-9)

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★ Preadolescence (preteen, or 'late childhood'. The child in this and the previous phase are called ''schoolchild'' (''schoolboy'' or ''schoolgirl''), when still of primary school age.) (10-12)

★ Adolescence and puberty (teenage) (13-19)

★ Young adult (19-25)

★ Adult (exact minimum age may vary)

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★ Early adulthood (20-39)

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★ Middle age (40-59)

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★ Advanced adult/Senior citizen/Old age (60+)

★ Death (occurs at various ages, depending on person)

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★ Decomposition (breakdown of the physical body after death)
Also sometimes used are terms that specify one's age in numbers, such as:

★ Child (0-12)

★ Teenager (13-19)

★ Twenty something (20-29)

★ Thirty something (30-39)

★ Forty something (40-49) (Formerly also Quadragenarian, rarely used since 1980)

★ Quinquagenarian (50-59)

★ Sexagenarian (60-69)

★ Septuagenarian (70-79)

★ Octogenarian (80-89)

★ Nonagenarian (90-99)

★ Centenarian (100-109)

★ Supercentenarian (110+)

Contents

Physical development milestones

See also

Physical development milestones

★ Ability to lift and control the orientation of the head

★ Crawling begins

★ Walking begins

★ Speech begins

★ Voice lowers in pitch (especially noticeable in boys)

★ Pubic hair appears

★ Genitals and reproductive organs mature

★ Menses begin (females)

★ Body hair and facial hair appears
Note: the Tanner stages can be used to approximately judge a child's age based on physical development.

See also

★ Child development

★ Developmental biology

★ Auxology

★ Embryogenesis

★ Mammalian embryogenesis

★ Life-history theory