The document outlines the various stages of human development from infancy to elderly age. It describes infants as children between 1 month and 12 months old who cannot speak. Childhood is defined as the period from birth to puberty. Adolescence involves the transition from puberty to legal adulthood and is associated with the teenage years. Young adulthood refers to people aged 20-40. Adulthood begins at sexual maturity and legal adulthood. Middle age comes after young adulthood but before old age. Old age, also called elderly age, consists of ages nearing or surpassing the average human life expectancy.

1. Being a Human.
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2. Infant
Elderly
Childhood
Middle
Age
Teenager/A
dolescence
Adult
Young
Adult
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3. 
An infant (from the Latin word infans, meaning "unable to speak" or
"speechless") is the very young offspring of a human or animal.When a
human child learns to walk, the term toddler may be used instead.
The term infant is typically applied to young children between the ages of 1
month and 12 months; however, definitions may vary between birth and 1
year of age, or even between birth and 2 years of age
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4. •
A child (plural: children) is a human between the stages of
birth and puberty.[1][2] The legal definition of child generally
refers to a minor, otherwise known as a person younger than
the age of majority.[1]
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5. 
Adolescence (from Latin adolescere, meaning "to grow up")[1] is a
transitional stage of physical and psychological human development that
generally occurs during the period from puberty to legal adulthood (age
of majority). The period of adolescence is most closely associated with
the teenage years,] though its physical, psychological and cultural
expressions may begin earlier and end later.
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6. •
A young/prime adult, according to Erik Erikson's stages
of human development, is generally a person in the age
range of 20 to 40.
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7. 
adult is a human being or other organism that has reached sexual
maturity. In human context, the term adult additionally has meanings
associated with social and legal concepts. In contrast to a "minor", a legal
adult is a person who has attained the age of majority and is therefore
regarded as independent, self-sufficient, and responsible.
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8. 
Middle age is the period of age beyond young adulthood but before the
onset of old age. Various attempts have been made to define this
age, which is around the third quarter of the average life span of human
beings.
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9. •
Old age or middle Age consists of ages nearing
or surpassing the life expectancy of human
beings, and thus the end of the human life
cycle. Euphemisms and terms for old people
include, old people (worldwide usage), seniors
(American usage), senior citizens (British and
American usage), older adults (in the social
sciences[1]), the elderly, and elders (in many
cultures including the cultures of aboriginal
people).
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