Stages of Adolescence Stages of Adolescence Adolescence adolescent stage stages of adolescence Middle Adolescence (Ages 14 to 17) teenagers HealthyChildren.org: Stages of Adolescence Stages of Adolescence – HealthyChildren.org HealthyChildren.org HealthyChildren.org American Academy of Pediatrics: Stages of Adolescence Stages of Adolescence American Academy of Pediatrics: Stages of Adolescence Stages of Adolescence STAGES OF ADOLSCENCE American Academy of Pediatrics: Stages of Adolescence Adolescence HealthyChildren.org: Stages of Adolescence