[At what age does cognitive decline begin? Sir William Osler, 1849-1919].
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D017668:Age of Onset; D000375:Aging; D003071:Cognition; D003072:Cognition Disorders / Q000266:history* / Q000523:psychology; D004501:Education, Medical / Q000266:history*; D005180:Faculty, Medical / Q000266:history; D005197:Famous Persons; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D008568:Memory; D011792:Quebec; D006113:United Kingdom; D014481:United States