Answer:
infant, early childhood, adolescent, young adult, middle adult, later adult
Step-by-step explanation:
infant: birth-2 y.o
early childhood: 2-5 y.o.
adolescent: 6-16 y.o.
young adult: 16-35 y.o.
middle adult: 35-60 y.o.
later adult: 60+ y.o.
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