Speaking More Languages Linked to Slower Ageing Across 27 Countries

Treasury yields hit their highest since 2002, then blinked. Stocks scraped out a small gain.

The quick scan: Thursday opened the fourth quarter with the bond market in charge again. The 10-year Treasury yield touched about 5.34%, its highest level since 2002, and stocks slipped in the morning. Then yields eased back to around 5.24% in the afternoon and all three major indexes clawed into the green. Oil rose about 3%, with Brent back above $100, after China reportedly suspended fuel exports for October. The S&P 500 broke a three-day losing streak. Europe fared worse, with London down 1.7% and Paris 1.6%.

S&P 500: +0.19% to 7,666.45 – rose 14.91 points and snapped a three-day losing streak, recovering from morning losses as yields pulled back; still down 1% for the week
Dow Jones: +0.04% to 50,926.56 – up 20.51 points after wavering around the flat line all day; bank stocks weighed, with the KBW bank index down as much as 2.4% intraday
NASDAQ: +0.04% to 26,871.60 – up 10.53 points; Micron rose after beating forecasts and raising its outlook, but bond-market pressure kept tech's gains small

What's driving it: Yields, again. The bond market has just come through its worst quarter in decades, and the 30-year yield also hit its highest since 2002. Two forces are pushing up: oil and inflation. The ISM manufacturing prices-paid index jumped to 77.9 in September, well above the 72 economists expected, a reminder that price pressure has not gone away. What turned the session was a pause in the selling. Fed Vice Chair Philip Jefferson said it may take more time to judge whether further rate hikes are needed, and yields eased. Weekly jobless claims fell for a fourth straight week, which keeps attention on Friday's September jobs report. Accenture jumped more than 15% after an earnings beat. Nike reported after the bell, beating on earnings but showing lower revenue, and its shares fell in after-hours trading.

Bottom line: A small gain on the day hides a market that is still nervous about interest rates. When the 10-year yield moves a tenth of a percentage point in a session, everything from bank shares to mortgage rates feels it. For L-Plate Retirees, this is a day to note, not to act on. The jobs report lands Friday and could move yields again. Today's article is about something that compounds well away from the bond market, and costs nothing to keep invested in.

Could Speaking Another Language Slow Down How Fast You Age?

The scoop: How many languages have you used this week? Not studied – used. Ordering coffee, scolding a grandchild, haggling at a market, muttering at the television when the referee gets it wrong.

For many of us the answer is more than one, and we rarely give it a second thought. A large European study suggests we might want to.

In November 2025, researchers led by Trinity College Dublin published a study in Nature Aging that looked at 86,149 people across 27 European countries. Their question was simple to ask and hard to answer: do people who live where speaking more than one language is common age more slowly than people who don't?

Their answer, with some important fine print, was yes.

How do you measure "ageing faster"?

Birthdays only tell you how long you've been here. They say nothing about how well the years have treated you. Two 68-year-olds can be very different 68-year-olds, as any school reunion will confirm.

To capture that difference, the team trained AI models on people's health and behavioural profiles to estimate what they call a "biobehavioral age gap" – the difference between the age a person's profile predicts and the age they actually are. If your profile looks older than your passport, you are ageing faster than expected. If it looks younger, you are ahead of the curve.

The models weighed risk factors such as hypertension, diabetes, sleep problems and sensory loss against protective factors such as education, cognition, functional ability and physical activity.

What they found

People in countries where speaking at least one additional language is common were 2.17 times less likely to show accelerated ageing. Monolinguals were more than twice as likely to show early ageing patterns.

The researchers adjusted for a long list of things that could muddy the picture – linguistic, social, physical and sociopolitical factors – and the link held. It held in both snapshot and long-term analyses.

And it added up. "The protective effect was cumulative," said Amoruso, the study's lead author. More languages, more protection.

Now for the fine print

This study did not test whether each individual who speaks two languages ages more slowly than their monolingual neighbour. Multilingualism was measured at the country level, not person by person. It is a finding about places, not a verdict on you.

Countries differ in a thousand ways, and no adjustment catches everything. This is an association, not proof that picking up Spanish at 63 will wind back your biological clock. Nothing here shows that a language stops ageing or shields anyone from any particular disease.

The study also covered only European countries. Readers in Singapore or Malaysia, where switching languages mid-sentence is ordinary, may find that intriguing, but nobody in this research looked at Asia. That is a question, not a finding.

A smaller, sharper follow-up

In August 2026, at the FENS Forum, Amoruso – now at the Basque Center on Cognition, Brain and Language – presented a follow-up that zoomed in on individual brains.

The team built a brain-ageing clock using magnetoencephalography – a scan that records the brain's magnetic activity – trained on 728 people. They then applied it to 144 people in the Basque region who spoke between one and four languages: Spanish, Basque, French and English.

After adjusting for age, sex and education, brains appeared about six years younger in people who spoke two languages, about seven years younger with three, and about 13 years younger with four. Higher proficiency and learning a second language earlier were both linked to more delayed brain ageing.

That 13-year figure will make headlines. It comes from 144 people, it was a conference presentation that has not yet been peer-reviewed, and it comes from the same research network rather than an independent team. The researchers themselves cautioned that lifestyle and social engagement may contribute.

Why would language matter at all?

Ibáñez, the study's senior author, explains that language learning engages brain networks for attention, memory, executive control and social interaction. Think of every time you hunt for the right word, switch languages depending on who is in front of you, or work out what the other person actually meant.

Language is also how we stay connected – to neighbours, to grandchildren, to the stallholder who knows your order before you open your mouth. A second language is often a second circle of people. Which leaves a question this research can't fully settle: is it the language doing the work, or the life that comes with it?

The uncomfortable bit for late starters

The FENS result linked earlier acquisition with more delayed brain ageing. If you are 60 and starting from zero, that is not the news you wanted.

But the same data also linked higher proficiency to the effect, and proficiency is something you can still build. Prof Christina Dalla, chair of the FENS committee, who was not involved in the research, backed language learning "at school and throughout life, even if it's hard".

Even if it's hard. We abandon the phrasebook after week three because we feel silly. Yet feeling silly – stumbling, reaching for words, being gently corrected by a waiter – may be exactly the kind of effort the researchers are describing.

Hernández, a co-author, called multilingualism "an accessible, low-cost tool". Just a willingness to sound slightly foolish in public for a while, which many of us have been practising for years.

So what does this mean for an L-Plate Retiree?

The languages you already have deserve to be used, not just kept. And if there is a language you half-learned and then set aside – the one your grandchildren speak, the one from a country you keep visiting, the one your parents spoke at home – this is a reasonable nudge to pick it back up. Not as medicine. As a way of staying curious, connected and a little bit stretched.

Actionable takeaways for L-Plate Retirees:

• Use the languages you already have. If you speak more than one language, keep them in daily circulation rather than letting one fade. Call the relative you only speak dialect with. The research rewards use and proficiency, and both slip when a language sits on the shelf.

• Pick up the language you put down. Most of us have one half-finished language somewhere in our past. Returning to it is easier than starting fresh, and the FENS follow-up linked higher proficiency with more delayed brain ageing. You cannot change when you first learned it. You can still change how well you speak it.

• Choose conversation over perfection. The researchers point to attention, memory, executive control and social interaction. A clumsy ten-minute chat with a neighbour or a grandchild exercises all four. Flawless grammar practised alone exercises fewer. Let yourself be corrected, laugh about it, and keep going.

• Read the headline numbers before you repeat them. The 2.17 figure comes from a country-level comparison, not from tracking individual speakers. The "13 years younger" figure comes from 144 people in a study not yet peer-reviewed, run by the same research network. Neither is a promise, and neither shows that a language stops ageing.

• Do not let a late start talk you out of it. The FENS result linked earlier learning with more delayed brain ageing, so someone raised with two languages has a head start you cannot buy back. But proficiency counted too, and Prof Christina Dalla backed language learning "throughout life, even if it's hard". Start from where you are.

• Treat language as part of a connected life, not a pill. The researchers themselves say lifestyle and social engagement may contribute. A new language usually comes with new people, new places and new reasons to leave the house, and those may matter as much as the words.

Your Turn: 
How many languages did you use this past week, even a few words of each, and did you notice yourself switching between them? 
Is there a language you half-learned years ago and quietly gave up on – and what would it take for you to start speaking it again, mistakes and all? 
The researchers can't fully separate the language from the life that comes with it. In your experience, has speaking another language brought new people or new places into your life?

👉 Hit reply and share your thoughts – your answers could inspire fellow readers in future issues.

If this issue helped you see what a study of 86,149 Europeans can and cannot tell you about speaking more than one language, consider supporting L-Plate Retiree on Ko-fi. Your support keeps these fine-print-first looks at how we age coming.