Speaking more languages slows brain aging
People who speak multiple languages appear to age biologically more slowly. That is the suggestion of a large European study spanning 27 countries, published in Nature Aging.
Multilingualism has long been associated with better cognitive health in later life. But is it really about aging as a biological process, or is it simply that smarter people both learn more languages and decline more slowly? The study, combining cross-sectional and longitudinal data from 27 European countries, attempted to answer that question by controlling for education, income, and other confounding factors.
The analyses found that multilingualism was associated with lower scores on biological aging markers, independent of known social and economic variables. The association held in both snapshot measurements and in follow-up data collected over multiple years. The authors note this is a corrected article, meaning a prior version contained an error; the substantive findings remain as reported.
Cognitive reserve as a protective mechanism
A widely used explanation is cognitive reserve: the idea that people who train their brains intensively and in varied ways are more resilient against degenerative changes. Constantly switching between languages, a process called task-switching, activates brain regions also involved in attention and executive control. That repeated engagement may make neural networks more robust over time.
What the study does not establish is that multilingualism causes slower aging: these are associations. Whether the reverse is also true, that people who age more slowly biologically are more inclined to learn languages, cannot be fully ruled out. The researchers themselves are cautious in their conclusions.
What does this mean for healthy aging?
The finding fits into a broader body of research showing that mental activity throughout life is associated with slower cognitive decline. Multilingualism is a particular case: it requires constant, largely unconscious regulation of two or more language systems. Whether learning a new language later in life produces the same effect is a question that future research will need to address.
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