People who speak multiple languages have brain structures that are 6 to 13 years younger in appearance compared to people who speak only one language.
See the scientific wording
Multilingual individuals exhibit brain structures that are, on average, 6 to 13 years younger than those of monolingual adults.
Correlational — new studies may shift this
Observational4 good-quality studies link this claim to the outcome, but causation is not established.
What the research says
4 studies reviewedSupporting (4)
Use of multiple languages provides cognitive reserve amidst age-related white matter changes.
Cohort StudyHuman2025
People who speak multiple languages have brains that look more worn out on scans, but they still think just as well as people who speak only one language — like their brains are acting younger than their actual age.
Cohort StudyHuman2025
People who speak more than one language tend to have bodies and brains that age more slowly than those who speak only one language, according to a huge study of nearly 90,000 people. This suggests their brains might look younger than their actual age.
How age of acquisition influences brain architecture in bilinguals
Cross-Sectional StudyHuman2015
People who learn a second language early have bigger brain areas linked to language and memory, which are usually smaller in older people — so their brains look younger. This doesn't prove their brains are exactly 6–13 years younger, but it shows a strong link between speaking more languages and healthier brain structure.
Contradicting (0)
No contradicting studies found yet
That doesn't mean it's settled — it just means no study has tested the opposite.
Quality-weighted scoring: we follow the GRADE framework — each study is rated High, Moderate, Low, or Very Low based on study design, methodology rigor, and risk of bias. A single high-quality RCT can outweigh several weaker observational studies.
Scores reflect study quality, not just count.
Speaking multiple languages forces the brain to constantly manage competing languages, which strengthens key brain regions involved in thinking, attention, and language control. These regions grow larger and stay healthier over time, so even as the brain ages, it keeps working like a younger one.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 4 supporting studies
How Fit Body Science checks a claim
- 1
We isolate the claim
Health advice from videos, articles and studies is broken down into single, testable claims.
- 2
We find the research
Each claim is matched against peer-reviewed studies, with every source cited by DOI.
- 3
We grade the evidence
Studies are scored on methodology, statistical rigor, transparency and publication quality.
The fitness and health internet is full of confident claims. We check them against real research.
Every claim on this site is traced back to peer-reviewed studies, scored on methodology and reporting quality, and given a verdict you can audit yourself — sources, DOIs and all.
- Full evidence breakdown and mechanism chains
- Ask our AI anything about a claim or its studies
- Get notified when new research changes a verdict