Speaking Four Languages Might Make Your Brain 13 Years Younger

Speaking more than one language may do more than help you order dinner on holiday. New research presented at the 2026 FENS Forum, the major meeting of the Federation of European Neuroscience Societies, suggests that multilingual brains look measurably younger than they should, and that the more languages a person speaks, the bigger the effect.

How the study worked

The research was led by Dr. Lucia Amoruso at the Basque Center on Cognition, Brain and Language in San Sebastián, Spain, with collaborators in Chile, Argentina, and Ireland. Spain's Basque region was a natural place to look, because it's common there to grow up speaking some mix of Spanish, Basque, French, and English.

The team first built a "brain ageing clock" using recordings from 728 people. They used magnetoencephalography (MEG), a non-invasive technique that measures the tiny magnetic fields produced by active brain cells, and trained an AI model on how patterns of brain connectivity typically change across a lifetime. They then applied that clock to a separate group of 144 people who spoke between one and four languages, to estimate each person's "brain age" and compare it with their real age.

What they found

Compared with people who spoke only one language:

• People who spoke two languages had brains that appeared about 6 years younger.
• Three-language speakers' brains appeared about 7 years younger.
• People fluent in four languages had brains that appeared about 13 years younger.

The effect wasn't a simple yes-or-no split between bilingual and monolingual people. Being more fluent, and learning a second language earlier in life, were both linked to slower brain ageing. Multilingual experience "matters as a gradient," Amoruso said, depending on "the depth and duration of language experience."

Crucially, the results held after the researchers adjusted for age, sex, and education. That matters, because people who speak several languages often have more schooling, which could otherwise explain the difference on its own.

"This study suggests that learning a second, third or fourth language could help our brains to stay younger for longer," said Professor Christina Dalla of the National and Kapodistrian University of Athens, who chairs the FENS communication committee and was not involved in the research.

What it doesn't prove

This is an observational study presented at a conference, not yet a peer-reviewed paper, so it shows an association rather than proof that languages cause slower ageing. Other factors that come with multilingual life, such as a more social lifestyle, weren't fully accounted for. The team now wants to test whether the same pattern shows up in people with Alzheimer's disease and other neurodegenerative conditions.

Good news for India

The likely explanation is that juggling several languages is constant mental exercise: the brain has to manage, switch between, and suppress competing word systems all day. For readers in India, where many people grow up speaking a mother tongue, Hindi, and English, often with a regional language or two on top, that's an encouraging thought. And if you've been putting off finally getting fluent in a language you started learning on an app, this is at least a good excuse to open it again.