Across the life span, cross-sectional studies of intelligence suggest that intelligence _____ as people get older and longitudinal studies of intelligence suggest that intelligence _____ as people get older, until very late in life.

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Cross-sectional studies, which compare different age groups at one point in time, often suggest that intelligence decreases with age. However, longitudinal studies, which follow the same individuals over time, generally find that intelligence remains stable or even increases until very late in life.

Across the Life Span, Cross-Sectional Studies of Intelligence Suggest That