Medline Plus is published by the National Library of Medicine. Of special interest are the sections "Videos y Multimedia" (short video tutorials on health topics) and "Pruebas Medicas" (an A-Z description of medical tests).
An A-Z list of topics related to aging, published by the NIH. Featured sections include Alzheimer's, Driving, Sleep, Hormones, Incontinence, and Vitamins.
Home page of the World Health Organization. Of special note are the infographic posters found in the "Newsroom" section, and the fact sheets under the "Health Topics" section.