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2016 ; 71
(6
): 968-977
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Early-Life Intelligence Predicts Midlife Biological Age
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Schaefer JD
; Caspi A
; Belsky DW
; Harrington H
; Houts R
; Israel S
; Levine ME
; Sugden K
; Williams B
; Poulton R
; Moffitt TE
J Gerontol B Psychol Sci Soc Sci
2016[Nov]; 71
(6
): 968-977
PMID26014827
show ga
OBJECTIVES: Early-life intelligence has been shown to predict multiple causes of
death in populations around the world. This finding suggests that intelligence
might influence mortality through its effects on a general process of
physiological deterioration (i.e., individual variation in "biological age"). We
examined whether intelligence could predict measures of aging at midlife before
the onset of most age-related disease. METHODS: We tested whether intelligence
assessed in early childhood, middle childhood, and midlife predicted midlife
biological age in members of the Dunedin Study, a population-representative birth
cohort. RESULTS: Lower intelligence predicted more advanced biological age at
midlife as captured by perceived facial age, a 10-biomarker algorithm based on
data from the National Health and Nutrition Examination Survey (NHANES), and
Framingham heart age (r = 0.1-0.2). Correlations between intelligence and
telomere length were less consistent. The associations between intelligence and
biological age were not explained by differences in childhood health or parental
socioeconomic status, and intelligence remained a significant predictor of
biological age even when intelligence was assessed before Study members began
their formal schooling. DISCUSSION: These results suggest that accelerated aging
may serve as one of the factors linking low early-life intelligence to increased
rates of morbidity and mortality.
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