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Infancy: newborn
Newborn is the first stage of infancy, this substage ranges from birth to one month. -
Infancy: infant (1)
Infant is the second stage of infancy, this substage ranges from one month to one year old. -
Childhood: early (5)
Early childhood is the first stage in childhood, this substage ranges from one to six years old. -
Childhood: middle (8)
Middle childhood is the second stage, this substage ranges from six to eight years old. -
Childhood: late (10)
Late childhood is the last substage in childhood, this substage ranges from nine to twelve years old. -
Youth: preteen (13)
The youth stage has four substages including preteen (12), early teen (13/14), middle teen (15/17), and late teen (18). -
Youth: early teen (15)
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Adulthood
Adulthood has three substages including young adult (18), mature adult (24), and aging adult (60+).