Thinking Of Learning A New Language? It May Actually Slow Down Brain Ageing, New Study Says

Thinking Of Learning A New Language? It May Actually Slow Down Brain Ageing, New Study Says

A longer life is one of the biggest achievements of humanity, yet it has thrust a single question into the spotlight: the question of how to age well has taken centre stage. Longer lifespans offer new opportunities for work, learning and connection, but they also bring familiar concerns: the mental and physical decline that often accompanies ageing.

Many older adults begin noticing small but disruptive changes, including difficulty in remembering names, trouble focusing on conversations, slower reactions or the need to pause during routine tasks. While these shifts are common, they also raise an important question: why do some individuals remain mentally sharp well into their 80s, while others experience accelerated decline?

Over the years, numerous studies have hinted that bilingualism or multilingualism might act as a buffer against cognitive decline. But findings were mixed, often limited by small sample sizes, inconsistent health measures or the inclusion of clinical rather than general populations.

Now, a new large-scale study published in Nature Aging in November 2025, provides strong evidence that multilingualism could play a meaningful role in slowing down how the brain ages, particularly in older adults. And the more languages a person speaks, the stronger the protective effect appears to be.

What Studies Say

The Nature Aging study examined 86,149 healthy adults aged 51-90, living in 27 European countries. By combining biological, cognitive and behavioural information, researchers created a new metric known as the “biobehavioural age gap."

This measure compares: A person's actual age with how old they appear biologically and cognitively, based on factors like daily functioning, movement, education, memory and health conditions such as hearing loss or heart disease.

If someone's predicted age is younger than their biological age, they have a negative biobehavioural age gap, a sign of slower ageing. If it is older, it is ageing faster than expected. Using machine learning models, researchers assessed patterns across thousands of data points, allowing them to estimate ageing with precision.

The next step was to examine multilingual exposure in each country. Some nations, such as Luxembourg, Finland, the Netherlands and Malta, have high rates of multilingualism built into daily life. Others, including the UK, Romania and Hungary, are largely monolingual.

Findings of The Study

Why Language Matters? The Brain Mechanism Behind It

Although the study did not directly measure brain structure, existing neuroscience research offers strong clues. When multilingual individuals navigate language, the brain's executive control network is constantly active. This includes regions responsible for:

Which Parts Of The Brain Get Stronger With Multiple Languages?

Neurology experts agree that lifelong use of multiple languages profoundly impacts the brain's executive control and cognitive networks. Dr Kunal Bahrani, Chairman and Group Director of Neurology at Yatharth Hospitals, explains that multilingualism strengthens regions such as the prefrontal cortex, anterior cingulate cortex, inferior parietal lobule and basal ganglia—areas responsible for attention, inhibition, conflict monitoring and task switching.

He adds that bilingual individuals often show improved white-matter connectivity, especially in the superior longitudinal fasciculus and the corpus callosum, enabling better communication between brain regions.

Adding to this, Dr Puja Kapoor, Pediatric Neurologist and Co-Founder of Continua Kids, highlights that language is deeply tied to cognition and intelligence. She notes that using multiple languages consistently stimulates brain circuits linked to vocabulary, expression, context monitoring and emotional reasoning. Early and continued exposure, she says, leads to stronger neuronal synapsing, enhancing cognitive performance across the lifespan.

How Does Switching Between Languages Act As “Cognitive Training"?

According to Dr Bahrani, switching between languages forces the brain to inhibit one language while activating another, all while monitoring context. This engages the same executive functions used in high-level cognitive tasks. Unlike structured “brain games," multilingual switching happens naturally and frequently, making it a powerful and practical form of mental exercise.

Dr Kapoor agrees, explaining that every language switch requires the brain to retrieve words, meanings and structures from stored memory, activating neural networks in the process. She compares this stimulation to solving mathematics or physics problems, playing musical instruments or completing puzzles like Sudoku. Each activity demands deep focus and active engagement, and language switching is equally effective in keeping the brain sharp.

Does The Biobehavioral Age Gap Accurately Show How The Brain Is Ageing?

The “biobehavioral age gap" used in the Nature Aging study offers valuable insight into functional ageing, but it comes with limitations. Dr Bahrani points out that although it is a useful indicator of cognitive ageing at the population level, it does not directly measure neurological pathology.

Factors such as education, lifestyle, mood and even the testing environment can influence the score. He stresses that this metric is best interpreted alongside imaging or biomarker data for a more complete picture of brain health.

Dr Kapoor adds that because language performance is closely linked to cognition, linguistic ability can act as a surrogate marker of overall cognitive strength. Regular stimulation—such as speaking multiple languages—helps keep neuronal connections active, which may influence how “young" a brain appears on cognitive assessments. While it is not a direct biological measure, she views the age-gap marker as meaningful in reflecting cognitive resilience.

How Does Speaking Multiple Languages Boost Mental Resilience?

Both neurologists agree that multilingualism contributes significantly to cognitive reserve. Dr Bahrani explains that multilingualism strengthens executive control networks, which differ from the semantic and problem-solving networks built through education or intellectually demanding jobs. Each form of reserve is valuable, he notes, but multilingualism uniquely enhances attention, inhibition and task-switching abilities, creating an additional layer of resilience.

Dr Kapoor describes multilingualism as a powerful and constant form of brain stimulation that integrates memory, social interaction, emotional expression and reasoning. She emphasises that, unlike education—which often peaks in early adulthood—language use remains a daily activity throughout life. This continuous engagement strengthens neural circuits in a way that other forms of cognitive training may not. Even people who struggle with skills like mathematics, she says, can achieve significant benefits through language-based stimulation.

Is it Too Late For Older Adults To Benefit From Learning A New Language?

Dr Bahrani emphasises that although early learning offers the strongest and longest-lasting benefits, older adults still gain significantly from picking up a new language. Learning requires attention, working memory and active engagement—all of which stimulate the brain. He stresses that consistent, real-life use of the language provides the greatest cognitive advantage.

Dr Kapoor agrees, noting that adults and elderly individuals can absolutely benefit from learning new languages. The process demands high focus, memory recall and active thinking, similar to solving complex puzzles. While earlier exposure leads to stronger synaptic development, late-life learning still strengthens neural pathways and contributes meaningfully to brain health.

The study adds clarity to a long-standing debate by offering powerful evidence that speaking multiple languages is associated with slower biological and cognitive ageing. While multilingualism is not a cure-all, it appears to help the brain stay flexible and resistant to age-related decline. And unlike many cognitive interventions, it is used in everyday communication.

Whether learned in childhood or much later in life, languages offer a remarkable resource, one that strengthens memory, sharpens attention and builds a reserve that may protect the brain for years to come.

As Dr Kapoor puts it, “The more we stimulate the brain—including through language learning—the more we can offset or slow degenerative diseases." And as Dr Bahrani notes, “Even one additional language provides a meaningful layer of cognitive resilience."

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For ageing individuals, multilingualism may not just be a skill, it may be a form of long-term brain health insurance.

Over the years, numerous studies have hinted that bilingualism or multilingualism might act as a buffer against cognitive decline. But findings were mixed, often limited by small sample sizes, inconsistent health measures or the inclusion of clinical rather than general populations.

Now, a new large-scale study published in Nature Aging in November 2025, provides strong evidence that multilingualism could play a meaningful role in slowing down how the brain ages, particularly in older adults. And the more languages a person speaks, the stronger the protective effect appears to be.

What Studies Say

The Nature Aging study examined 86,149 healthy adults aged 51-90, living in 27 European countries. By combining biological, cognitive and behavioural information, researchers created a new metric known as the “biobehavioural age gap.”

This measure compares: A person's actual age with how old they appear biologically and cognitively, based on factors like daily functioning, movement, education, memory and health conditions such as hearing loss or heart disease.

If someone's predicted age is younger than their biological age, they have a negative biobehavioural age gap, a sign of slower ageing. If it is older, it is ageing faster than expected. Using machine learning models, researchers assessed patterns across thousands of data points, allowing them to estimate ageing with precision.

The next step was to examine multilingual exposure in each country. Some nations, such as Luxembourg, Finland, the Netherlands and Malta, have high rates of multilingualism built into daily life. Others, including the UK, Romania and Hungary, are largely monolingual.

Findings of The Study

Why Language Matters? The Brain Mechanism Behind It

Although the study did not directly measure brain structure, existing neuroscience research offers strong clues. When multilingual individuals navigate language, the brain's executive control network is constantly active. This includes regions responsible for:

Which Parts Of The Brain Get Stronger With Multiple Languages?

Neurology experts agree that lifelong use of multiple languages profoundly impacts the brain's executive control and cognitive networks. Dr Kunal Bahrani, Chairman and Group Director of Neurology at Yatharth Hospitals, explains that multilingualism strengthens regions such as the prefrontal cortex, anterior cingulate cortex, inferior parietal lobule and basal ganglia—areas responsible for attention, inhibition, conflict monitoring and task switching.

He adds that bilingual individuals often show improved white-matter connectivity, especially in the superior longitudinal fasciculus and the corpus callosum, enabling better communication between brain regions.

Adding to this, Dr Puja Kapoor, Pediatric Neurologist and Co-Founder of Continua Kids, highlights that language is deeply tied to cognition and intelligence. She notes that using multiple languages consistently stimulates brain circuits linked to vocabulary, expression, context monitoring and emotional reasoning. Early and continued exposure, she says, leads to stronger neuronal synapsing, enhancing cognitive performance across the lifespan.

How Does Switching Between Languages Act As “Cognitive Training”?

According to Dr Bahrani, switching between languages forces the brain to inhibit one language while activating another, all while monitoring context. This engages the same executive functions used in high-level cognitive tasks. Unlike structured “brain games,” multilingual switching happens naturally and frequently, making it a powerful and practical form of mental exercise.

Dr Kapoor agrees, explaining that every language switch requires the brain to retrieve words, meanings and structures from stored memory, activating neural networks in the process. She compares this stimulation to solving mathematics or physics problems, playing musical instruments or completing puzzles like Sudoku. Each activity demands deep focus and active engagement, and language switching is equally effective in keeping the brain sharp.

Does The Biobehavioral Age Gap Accurately Show How The Brain Is Ageing?

The “biobehavioral age gap” used in the Nature Aging study offers valuable insight into functional ageing, but it comes with limitations. Dr Bahrani points out that although it is a useful indicator of cognitive ageing at the population level, it does not directly measure neurological pathology.

Factors such as education, lifestyle, mood and even the testing environment can influence the score. He stresses that this metric is best interpreted alongside imaging or biomarker data for a more complete picture of brain health.

Dr Kapoor adds that because language performance is closely linked to cognition, linguistic ability can act as a surrogate marker of overall cognitive strength. Regular stimulation—such as speaking multiple languages—helps keep neuronal connections active, which may influence how “young” a brain appears on cognitive assessments. While it is not a direct biological measure, she views the age-gap marker as meaningful in reflecting cognitive resilience.

How Does Speaking Multiple Languages Boost Mental Resilience?

Both neurologists agree that multilingualism contributes significantly to cognitive reserve. Dr Bahrani explains that multilingualism strengthens executive control networks, which differ from the semantic and problem-solving networks built through education or intellectually demanding jobs. Each form of reserve is valuable, he notes, but multilingualism uniquely enhances attention, inhibition and task-switching abilities, creating an additional layer of resilience.

Dr Kapoor describes multilingualism as a powerful and constant form of brain stimulation that integrates memory, social interaction, emotional expression and reasoning. She emphasises that, unlike education—which often peaks in early adulthood—language use remains a daily activity throughout life. This continuous engagement strengthens neural circuits in a way that other forms of cognitive training may not. Even people who struggle with skills like mathematics, she says, can achieve significant benefits through language-based stimulation.

Is it Too Late For Older Adults To Benefit From Learning A New Language?

Dr Bahrani emphasises that although early learning offers the strongest and longest-lasting benefits, older adults still gain significantly from picking up a new language. Learning requires attention, working memory and active engagement—all of which stimulate the brain. He stresses that consistent, real-life use of the language provides the greatest cognitive advantage.

Dr Kapoor agrees, noting that adults and elderly individuals can absolutely benefit from learning new languages. The process demands high focus, memory recall and active thinking, similar to solving complex puzzles. While earlier exposure leads to stronger synaptic development, late-life learning still strengthens neural pathways and contributes meaningfully to brain health.

The study adds clarity to a long-standing debate by offering powerful evidence that speaking multiple languages is associated with slower biological and cognitive ageing. While multilingualism is not a cure-all, it appears to help the brain stay flexible and resistant to age-related decline. And unlike many cognitive interventions, it is used in everyday communication.

Whether learned in childhood or much later in life, languages offer a remarkable resource, one that strengthens memory, sharpens attention and builds a reserve that may protect the brain for years to come.

As Dr Kapoor puts it, “The more we stimulate the brain—including through language learning—the more we can offset or slow degenerative diseases.” And as Dr Bahrani notes, “Even one additional language provides a meaningful layer of cognitive resilience.”

For ageing individuals, multilingualism may not just be a skill, it may be a form of long-term brain health insurance.

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Source: News18
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