Before your teen turns 18 and becomes a legal adult, figure out if they will need help making health care decisions. See the “Supported Decision Making & Guardianship” section for more information. *Unless other arrangements have been made (ie., healthcare power of attorney), at age 18, the individual is a legal adult and legally responsible for their care. You cannot access their medical information or be in the doctor’s visit unless your young adult agrees or certain legal forms have been completed.