Growing old, growing aged.
D000368:Aged; D000375:Aging; D001634:Bibliographies as Topic; D005853:Geriatrics / Q000266:history* / Q000639:trends; D049668:History, 15th Century; D049669:History, 16th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D049690:History, Ancient; D049691:History, Medieval; D006801:Humans