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the claim

Fluid intelligence consistently declines with normal aging

the verdict
SUPPORTED
the evidence backs this
Recorded sources
3 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Fluid intelligence consistently declines as part of normal cognitive aging, peaking in early adulthood and showing gradual to steep reductions in later decades.

The analysis

The claim is a well-established psychological finding regarding cognitive aging. Retrieved papers such as [1], [4], and [6] consistently support the empirical observation that fluid intelligence and related processing abilities decline as individuals age.

Evidence for · 3
Age-Related Trajectories of General Fluid Cognition and Functional Decline in the Health and Retirement Study: A Bivariate Latent Growth Analysis
Recorded source metadata

Elizabeth P. Handing, Yuqin Jiao, Stephen Aichele. Age-Related Trajectories of General Fluid Cognition and Functional Decline in the Health and Retirement Study: A Bivariate Latent Growth Analysis. 2023. https://doi.org/10.3390/jintelligence11040065

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?
Recorded source metadata

Momy AM, Baena D, Ray LB, Owen A, Fogel SM. Are Age-Related Differences in Sleep Associated With the Different Trajectories of Fluid and Crystallized Intelligence Across the Lifespan?. 2026. https://doi.org/10.1111/jsr.70364

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.
Recorded source metadata

Menor J. 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. https://doi.org/10.3389/fnagi.2026.1736609

Paper 6 finds significant negative correlations between age and multiple cognitive variables, including working memory and processing speed.

The paper trail · every fact has a biography
first checked01 Aug 2026
judged → SUPPORTED · 7901 Aug 2026
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