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Infant stage lasts for 0 to 18 months
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Toddler stage lasts from 18 months to 3 years
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Childhood lasts for 3 years of age to 13.
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Adolesence last from age 12 to 19
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Young Adulthood last from 20 years of age through the 30's.
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Middle Adulthood ranges form age 40 to age 60.
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Late adulthood is age 60 and lasts until death.