Although cross-sectional studies typically show that mental abilities decline with age, when longitudinal studies are used, these age-related declines typically are seen to be nonexistent or much smaller.

Question

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Cross-sectional studies compare people of different ages at one point in time, while longitudinal studies follow the same individuals over time. Longitudinal studies have been found to provide a more accurate picture of age-related changes, and they tend to show less decline in mental abilities than cross-sectional studies.

Although Cross-Sectional Studies Typically Show That Mental Abilities Decline with Age