title: Successful aging: definitions and prediction of longevity and conversion to mild cognitive impairment.
abstract: OBJECTIVE
  To examine alternative models of defining and characterizing successful aging.
  
  
  METHODS
  A retrospective cohort study.
  
  
  METHODS
  Olmsted County, MN.
  
  
  METHODS
  Five hundred sixty community-dwelling nondemented adults, aged 65 years and older.
  
  
  METHODS
  Three models were developed. Each model examined subtests in four cognitive domains: memory, attention/executive function, language, and visuospatial skills. A composite domain score was generated for each of the four domains. In Model 1, a global z score was further generated from the four cognitive domains, and subjects with mean global z score in the top 10% were classified as "successful agers," whereas those in the remaining 90% were classified as "typical agers." In Model 2, subjects with all four domain scores above the 50th percentile were classified as "successful agers." In Model 3, a primary neuropsychological variable was selected from each domain, and subjects whose score remained above - 1 standard deviation compared with norms for young adults were labeled successful agers. Validation tests were conducted to determine the ability of each model to predict survival and conversion to mild cognitive impairment (MCI).
  
  
  RESULTS
  Model 1 showed 65% lower mortality in successful agers compared with typical agers and also a 25% lower conversion rate to MCI.
  
  
  CONCLUSIONS
  Model 1 was most strongly associated with longevity and cognitive decline; as such, it can be useful in investigating various predictors of successful aging, including plasma level, APOE genotype, and neuroimaging measurements.
authors: Department of Neurology, Mayo Clinic, Rochester, MN 55905, USA. negash.selamawit@mayo.edu
authors: Selam
authors: S
authors: Negash
authors: Glenn E
authors: GE
authors: Smith
authors: Shane
authors: S
authors: Pankratz
authors: Jeremiah
authors: J
authors: Aakre
authors: Yonas E
authors: YE
authors: Geda
authors: Rosebud O
authors: RO
authors: Roberts
authors: David S
authors: DS
authors: Knopman
authors: Bradley F
authors: BF
authors: Boeve
authors: Robert J
authors: RJ
authors: Ivnik
authors: Ronald C
authors: RC
authors: Petersen
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