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Researchers using a 1972 school-leaving-age reform in England, Scotland and Wales found that the extra year of required schooling was associated with fewer dementia diagnoses decades later. The reduction was also found among people with high genetic susceptibility, although the size and durability of the effect remain uncertain.
A 1972 school-leaving-age reform that kept some teenagers in school for an extra year was linked to fewer dementia diagnoses decades later, including among people with high genetic susceptibility, according to a study by researchers at the University of Southern California, the University of Wisconsin–Madison and the University of Michigan. Published in the Proceedings of the National Academy of Sciences, the research uses the policy change to assess whether additional education itself can affect later dementia risk.
The researchers examined a reform implemented in England, Scotland and Wales that raised the minimum school-leaving age from 15 to 16. The rule applied to students born on or after September 1, 1957; those born shortly before that cutoff could still leave school at 15. The policy increased the share of students who remained in education until at least age 16 by 14 percentage points.
Using UK Biobank data, the team compared people born just before and after the cutoff, whose schooling requirements differed while their birth dates were close. Dementia outcomes were tracked through age 65 using hospital records, death registries and self-reported medical history. Those required to stay in school longer were less likely to receive a dementia diagnosis, the study reports.
The researchers then assessed genetic information and found a reduction in dementia incidence among participants with high inherited risk as well. The paper says the findings provide evidence that education can reduce diagnosed dementia and mitigate genetic risk. The results concern the additional schooling induced by this particular reform; they do not establish that every form or duration of education has the same effect.
Schooling May Modify Inherited Risk
The findings speak to a persistent challenge in dementia research: people with more education have often been observed to have lower dementia risk, but that association can reflect other differences, including family background and socioeconomic circumstances. By exploiting a policy cutoff, the researchers sought to isolate the effect of schooling from those factors. The study therefore offers evidence beyond a simple comparison of more- and less-educated people, though it cannot rule out every possible explanation.
The results also suggest that genetic risk is not a complete prediction of an individual’s future health. The reported effect among people with high genetic susceptibility indicates that life circumstances may shape whether inherited risk leads to diagnosed disease. That is relevant to public discussion of prevention because it points to possible influences earlier in life, rather than only measures taken close to the age when symptoms appear.
Education may affect health through several routes, including employment, income, cognitive stimulation and social circumstances. The study found that additional schooling also raised household income and was associated with fewer strokes and heart attacks. Those results could help guide future research, but they do not show which pathway explains the dementia finding or establish education as a clinical prevention measure.
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A Policy Cutoff Enables Comparison
Education and dementia have been linked in earlier research, but observational patterns alone cannot show that schooling caused a difference. People who remain in school longer may also differ in health, resources or circumstances that independently affect dementia risk later in life. The 1972 reform offers researchers a way to address part of that problem: people born on either side of the September 1 cutoff faced different legal requirements despite being born close together.
The study’s design treats the reform as a source of variation in schooling and compares outcomes around that threshold. Researchers describe it as evidence of a causal effect of the additional education induced by the policy. The distinction matters: the result applies to the people whose schooling changed because of the rule, and does not by itself establish the impact of all educational policies or prove how the effect arose.
The paper, titled Education reduces dementia incidence and mitigates genetic risk, was published in 2026 in the Proceedings of the National Academy of Sciences. Its authors include lead author Silvia Barcellos, a health economist affiliated with USC’s Center for Economic and Social Research and the University of Wisconsin–Madison, and coauthor Leandro Carvalho, an associate professor of economics at USC.
“Our findings provide evidence that education itself can reduce dementia risk decades later.”
— Silvia Barcellos, lead author
Effect Size and Mechanisms Remain Open
The study does not establish how large the reduction in dementia risk is with precision. The researchers say dementia was still uncommon among participants in this relatively young group, making the estimates imprecise. Because follow-up extended only through age 65, it is also not yet clear whether the reduction will persist as participants grow older and dementia becomes more common.
The underlying mechanism is unresolved. Additional schooling coincided with higher household income and lower incidence of stroke and heart attack, but the study could not determine whether those changes, more cognitively stimulating work, other health differences or a combination of factors accounted for the dementia result. The findings also concern diagnosed dementia, and the source material does not establish effects on every dementia subtype separately.
The results should not be read as showing that genetic risk can be eliminated or that an additional school year guarantees protection for an individual. They identify a population-level result associated with policy-driven schooling and leave the size, pathways and long-term persistence of that result to be tested.
Longer Follow-Up Will Test Persistence
The next step identified by the researchers is to follow participants as they age. Longer observation can show whether the lower dementia incidence remains as more people reach ages when diagnoses become more common, and may make estimates of the effect more precise.
Further work will also be needed to clarify how education may influence later brain health and whether the same pattern appears in other populations or under different education policies. For now, the study adds evidence that a policy-driven increase in schooling may affect dementia outcomes decades later, while leaving the size and explanation of that effect unsettled.
Key Questions
What did the study find?
Researchers reported that people required to stay in school for an additional year under a 1972 reform were less likely to be diagnosed with dementia later. The reduction was also found among participants classified as having high genetic susceptibility.
Where did the school reform apply?
The reform raised the minimum school-leaving age from 15 to 16 in England, Scotland and Wales. It applied to students born on or after September 1, 1957.
Does the study show that education prevents dementia for everyone?
No. It provides evidence about additional schooling induced by this specific policy and its association with diagnosed dementia in the studied group. It does not show that education guarantees protection for an individual or that all education programs have the same effect.
How might additional schooling affect dementia risk?
The researchers could not identify the mechanism. Potential pathways include changes in income, employment, cognitive stimulation and health, but the study does not establish which, if any, explains the result.
What remains to be learned?
The effect size is imprecise because dementia diagnoses were uncommon in this relatively young cohort. Longer follow-up is needed to test whether the finding persists as participants age and to clarify how schooling may influence risk.
Source: rss
