title: Is the emergence of functional ability decline in early old age related to change in speed of cognitive processing and also to change in personality?
abstract: OBJECTIVE
  To test whether the onset of functional ability decline in early old age is related to change in speed of cognitive processing and personality characteristics.
  
  
  METHODS
  Among 500 randomly sampled participants, the 230 cases that did not show impairment in functional ability were selected. Mean age at Time 1 was 62.4 years. For this subsample, the emergence of functional ability decline was tracked across a 12-year observation period.
  
  
  RESULTS
  The emergence of functional ability decline was related to change in speed of cognitive processing. Decline in functional ability was also related to increased neuroticism and external control, whereas this was not the case regarding extraversion and internal control.
  
  
  CONCLUSIONS
  Cognitive processing speed was shown to be a predictor of functional disability decline; in addition, the results provided initial evidence that functional ability decline in the early aging phase could be accompanied by changes in personality, particularly neuroticism and external control.
authors.affiliation: Institute of Psychology, Department of Psychological Aging Research, Heidelberg University, Bergheimer St. 20, 69115 Heidelberg, Germany. h.w.wahl@psychologie.uni-heidelberg.de
authors.forename: Hans-Werner
authors.initials: HW
authors.lastname: Wahl
authors.forename: Marina
authors.initials: M
authors.lastname: Schmitt
authors.forename: Daniel
authors.initials: D
authors.lastname: Danner
authors.forename: Antonia
authors.initials: A
authors.lastname: Coppin
mesh_terms: D000203:Activities of Daily Living; D000367:Age Factors; D000368:Aged; D000375:Aging / Q000523:psychology*; D003071:Cognition; D005260:Female; D015577:Geriatric Assessment; D014943:Global Health; D006801:Humans; D007389:Internal-External Control; D008297:Male; D009497:Neurotic Disorders / Q000453:epidemiology* / Q000523:psychology; D010551:Personality