What question did this study set out to answer?

This research aims to investigate cognitive changes associated with aging over a 20-year period.

The University of Manchester Longitudinal Study of Cognition in Normal Healthy Old Age, 1983 through 2003

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Longitudinal study examines cognitive change in older adults, suggesting implications for healthy aging.

This research aims to investigate cognitive changes associated with aging over a 20-year period.
Longitudinal design involving 6542 healthy adults aged 42 to 92 from Greater Manchester and Newcastle-upon-Tyne.
Biennially administered cognitive tests and psychological inventories including depression scales and lifestyle assessments.
Analysis of blood and saliva samples for blood chemistry and cortisol levels.
Significant cognitive changes were observed over the 20 years leading up to death.
Random effects analysis highlighted the impact of participant drop-out and practice effects from repeated testing on cognitive change measurements.
Variability in cognitive changes was identified, suggesting that individual differences can increase over time.

Rabbitt et al. (2004) studied this question.

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