Both cross-sectional and longitudinal studies reveal substantial declines in mental abilities during the 70s and 80s.

Question

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Both cross-sectional and longitudinal studies have shown that, on average, certain mental abilities tend to decline during the 70s and 80s. This includes aspects such as memory, processing speed, and fluid intelligence, although there is considerable individual variability in these changes.

Both Cross-Sectional and Longitudinal Studies Reveal Substantial Declines in Mental