Summary: Researchers combined artificial intelligence with ultra-sensitive magnetic brain imaging to chart how the brain ages. Studying a multilingual population from Spain’s Basque region, they found a clear gradient: the more languages a person speaks — and the earlier and more fluently they acquired them — the younger their brain appears on objective measures of neural connectivity.
On average, speaking two languages was associated with brains that looked about six years younger than chronological age. Trilingual participants showed roughly a seven-year advantage, while those fluent in four languages presented brains that appeared approximately thirteen years younger.
Key Facts
- Building the neural clock: The team trained an AI model on magnetoencephalography (MEG) connectivity data from a large reference group of 728 people spanning many ages to define a reliable baseline of normal brain ageing.
- Testing in a multilingual population: That “brain aging clock” was then applied to a test cohort of 144 participants from the Basque Country, a region where people commonly speak between one and four languages such as Spanish, Basque, French and English.
- A graded multilingual benefit: Comparing chronological age to the AI-derived brain age revealed a stepwise preservation of neural connectivity linked to language count:
- Bilingual (2 languages): ~6 years younger brain age than expected.
- Trilingual (3 languages): ~7 years younger brain age than expected.
- Quadrilingual (4 languages): ~13 years younger brain age than expected.
- Experience and timing matter: The protective effect is not merely binary. Higher proficiency, greater fluency, and acquiring a second language early in life were all associated with stronger delays in brain ageing.
- Cognitive control is key: The researchers note the brain must continuously inhibit non-target languages when a multilingual person speaks. This ongoing control and competition between languages likely keeps neural networks engaged and resilient.
- Next research steps: Future studies will examine whether managing very similar languages produces an even stronger preservation effect and whether lifelong multilingualism can help maintain independence in people with neurodegenerative conditions such as Alzheimer’s disease.
Source: FENS
People who speak more than one language appear to have younger brains, according to research presented at the Federation of European Neuroscience Societies (FENS) Forum 2026.
The brain comprises billions of neurons that communicate across networks. With age, connectivity between these cells tends to weaken, which commonly contributes to slower thinking and memory decline. This study used MEG, a technique that records the faint magnetic fields produced by active neurons, together with AI analysis, to determine how closely an individual’s brain connectivity pattern matches that typical of younger or older adults.
Dr Lucia Amoruso of the Basque Center on Cognition, Brain and Language led the work with collaborators from the Latin American Brain Health Institute (Universidad Adolfo Ibañez), the Cognitive Neuroscience Center (Universidad de San Andres), and the Global Brain Health Institute at Trinity College Dublin. Their earlier, larger-scale research suggested that populations where multilingualism is common also show slower markers of brain ageing; this study examines that idea at the individual level using direct neural measurements.
After establishing a data-driven brain ageing model from 728 people, the researchers applied it to 144 Basque-region participants who spoke between one and four languages. The AI-derived brain ages were then compared to participants’ chronological ages. Results showed a consistent association between the number of languages spoken and younger-appearing brains, with stronger effects tied to earlier acquisition and higher language proficiency.
Dr Amoruso summarized the finding: “In simple terms, people who spoke more languages tended to have brains that looked younger than expected for their chronological age. The effect was not only related to the number of languages spoken. Higher language proficiency and earlier acquisition of a second language were also associated with more delayed brain ageing. This suggests that multilingual experience matters as a gradient: it is not simply about being bilingual or not, but about the depth and duration of language experience.”
The investigators controlled for age, sex and education, but they note other lifestyle factors such as physical activity, diet and social engagement could also influence brain health and may contribute to these results. To better understand mechanisms and causal pathways, the team plans longitudinal studies and trials in clinical populations.
Professor Christina Dalla, chair of the FENS Forum communication committee, commented on the broader context: “Many behaviors—non-smoking, good nutrition, social and artistic engagement, and physical activity—help preserve brain health. Engaging in effortful learning, like acquiring a new language, appears to activate neuroplasticity and may contribute to maintaining cognitive resilience. There are social and cultural reasons to support language learning, and this research adds brain health as another strong incentive.”
Key Questions Answered:
A: Multilingualism forces continuous competition and control among co-activated languages. That constant regulation and selection process keeps communication pathways active and reinforces neural connectivity over time, similar to how regular exercise preserves muscle function. The study’s imaging data show this sustained activity corresponds to connectivity profiles typically seen in younger brains.
A: A brain aging clock is an algorithm trained on neurophysiological data to predict the typical neural connectivity expected at each age. The researchers used MEG recordings from many individuals to teach an AI model what a healthy brain looks like across the lifespan. Applying that model to the multilingual group allowed comparison between predicted brain age and actual chronological age.
A: It is worthwhile at any age. The study indicates the strongest effects arise when additional languages are acquired early and practiced to high proficiency, but adult language learning still offers substantial cognitive benefits. Effortful learning promotes neuroplasticity, so starting a new language later in life remains an effective way to stimulate and maintain brain function.
Editorial Notes:
- This article was edited by a Neuroscience News editor.
- Journal paper reviewed in full.
- Additional context added by our staff.
About this multilingualism and brain aging research news
Author: Kerry Noble
Source: FENS
Contact: Kerry Noble – FENS
Image: The image is credited to Neuroscience News
Original Research: The study was presented at FENS Forum 2026