The correct order is:
infancy - newborn to 1 1/2 yrs old
toddlerhood - 2yrs old
early childhood - 3yrs old - 5yrs old
middle childhood - 6yrs - 11 yrs old
adolescence - 12yrs to 19yrs old
early adulthood - 20yrs - mid 30's
middle adulthood - late 30's - mid sixties
late adulthood - late 60s and upwards until death.