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What cognitive changes can be expected with normal ageing?

H Christensen1

  • 1The Centre for Mental Health Research, The Australian National University, Canberra. helen.christensen@anu.edu.au

The Australian and New Zealand Journal of Psychiatry
|May 7, 2002
PubMed
Summary
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Cognitive speed and memory decline with age, but crystallized abilities remain intact. Factors like education, health, and activity may protect against cognitive decline, suggesting preventative strategies are possible.

Area of Science:

  • Gerontology
  • Neuroscience
  • Cognitive Psychology

Background:

  • Summarizes evidence on cognitive decline during aging.
  • Highlights individual variability in aging responses.
  • Identifies risk factors influencing cognitive decline rates.

Purpose of the Study:

  • Examine the course and diversity of cognitive decline.
  • Investigate predictors of cognitive decline.
  • Analyze individual differences in cognitive aging.

Main Methods:

  • Utilized data from the Canberra Longitudinal Study (887 participants, aged 70-93).
  • Followed participants from 1991 to 1998.
  • Reviewed 34 studies on risk factors: education, APOE ε4, health, activity, blood pressure.

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Main Results:

  • Cognitive speed and memory decline with age; crystallized abilities remain intact.
  • Increased variability in memory and speed test scores with age.
  • Poor health, low education, inactivity, APOE ε4, and high blood pressure predict faster decline.

Conclusions:

  • Cognitive aging is diverse, possibly involving multiple processes.
  • Education, good health, APOE ε4 absence, and activity may be protective.
  • Preventative strategies and analysis of individual differences are crucial for cognitive health in later life.