title: Mental health of the oldest old: the relevance of centenarian studies to psychogeriatric research.
authors.forename: K
authors.initials: K
authors.lastname: Ritchie
mesh_terms: D000368:Aged; D000369:Aged, 80 and over / Q000523:psychology / Q000706:statistics & numerical data; D019456:Health Transition; D006801:Humans; D008603:Mental Health; D012107:Research Design / Q000592:standards*; D019366:Western World