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Cognitive decline begins earlier than expected, even in middle age. This study tracked 10,308 adults aged 45-70 over ten years, finding cognitive function decreased across all age groups.

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Area of Science:

  • Neuroscience
  • Gerontology
  • Cognitive Psychology

Background:

  • Dementia has a long preclinical phase, with hallmark pathologies like neurofibrillary tangles and amyloid plaques present in young adults.
  • Early detection of cognitive decline is crucial for understanding dementia progression.

Purpose of the Study:

  • To investigate whether cognitive function decline can be detected in middle-aged adults.
  • To establish the trajectory of cognitive changes over a decade in individuals aged 45-70.

Main Methods:

  • Longitudinal study design involving 10,308 participants.
  • Cognitive function assessed via repeated testing over a ten-year period.
  • Participants categorized into age groups: 45-49, 50-54, 55-59, 60-64, and 65-70.

Main Results:

  • Cognitive scores showed a decline across all tested age categories.
  • The rate of cognitive decline was observed to be faster in older age groups.
  • Evidence suggests cognitive changes are detectable from age 45 onwards.

Conclusions:

  • Cognitive decline is not exclusive to older age and can be identified in middle-aged individuals.
  • The findings support the concept of a prolonged preclinical period for cognitive impairment.
  • Early monitoring of cognitive function in midlife may aid in identifying individuals at risk for later-life cognitive disorders.