Fluid intelligence consistently declines with normal aging
the verdict
SUPPORTED
the evidence backs this
confidence 79/100
Fluid intelligence consistently declines as part of normal cognitive aging, peaking in early adulthood and showing gradual to steep reductions in later decades.
Evidence for · 3
Age-Related Trajectories of General Fluid Cognition and Functional Decline in the Health and Retirement Study: A Bivariate Latent Growth Analysis
2023 · cited by 4
Paper 1 demonstrates that general fluid cognition declines on average across adulthood, particularly showing sharper drops at older ages in a large population sample.
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More for · 2
Are Age-Related Differences in Sleep Associated With the Different Trajectories of Fluid and Crystallized Intelligence Across the Lifespan?
2026 · cited by 0
Paper 4 notes that fluid intelligence peaks in early adulthood and subsequently declines with age, contrasting with crystallized intelligence.
Processing speed moderates the relationship between age and crystallized intelligence and influences the indirect effect of age on verbal working memory in middle-aged and older adults.
2026 · cited by 0
Paper 6 finds significant negative correlations between age and multiple cognitive variables, including working memory and processing speed.