The old and the young.
D000293:Adolescent; D000368:Aged; D002648:Child; D002657:Child Development; D002675:Child, Preschool; D003695:Delivery of Health Care / Q000639:trends*; D006299:Health Services for the Aged / Q000639:trends*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D001523:Mental Disorders / Q000517:prevention & control*