One thing I've never seen discussed on this topic (possible I just missed it, I only read popular accounts) is whether speaking multiple languages is a proxy for higher sociability / stronger social ties. That's a known dimension that improves health and aging and I wonder if just being able or interested in speaking with a broader swath of people is what helps more than the cognitive demands of switching.

Sadly, this beneficial activity doesn’t look promising in the longterm. Real-time interpretation of foreign languages through earbuds is already available in its nascent phase, and China at least has begun cutting foreign-language programmes at its unis because such AI translation is seen as the way of future. Once this tool becomes adopted enough societally, the learning of foreign languages is going to become a very niche hobby. It’s already becoming a niche hobby when many developed-country Gen Z are content with traveling and working abroad with only a knowledge of English alongside their native language.

Some peer criticism from: Vanhove, J. (2026). Does multilingualism really protect against accelerated ageing? Critical comments on Amoruso et al. (2025). Journal of Multilingual and Multicultural Development, 1–10.

"As the authors correctly point out in their discussion, their observational study does not allow them to establish any causal links between the degree of multilingualism in a country and the extent to which its inhabitants show signs of accelerated ageing. Unfortunately, they do not seem to have kept this insight in mind when they came up with the title (‘Multilingualism protects …’) and the abstract (‘These results underscore the protective role of multilingualism …’) that grabbed the media's attention."

"The authors use country-level data on multilingualism, namely the estimated percentage of monolinguals in the country (the Mono variable in BAG_OR_cross.csv), the estimated percentage of people in the country who know exactly one additional language (One), those who know exactly two additional languages (Two), and those who know at least three additional languages (Three), always at the time of data collection."

"According to a simple OLS regression model at the country level with the monolingualism percentage as its sole predictor, a 10-percentage-point difference in monolingualism is associated with a difference in the average GAP value of about 0.36 years (some 133 days; 95% CI: (58,207) days). If log-per-capita GDP is controlled for, a 10-percentage-point difference in monolingualism is associated with a difference in the average GAP value of about 0.29 years (some 105 days; 95% CI: (22,188) days)."

> Dr Amoruso said: “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.”

https://www.fens.org/news-activities/news/speaking-another-l...

I think any multilingual person will be skeptical of your analysis. Translation is not a substitute for understanding the original. It's good that we have translations, but it isn't the same. As you get into consuming art, literature, poetry, commentary, this is relevant.

That seems like saying weightlifting is pointless because we have robots for lifting and moving things around. But lifting weights can improve health and lifespan. It may also be that thinking in another language is different from merely translating because of the idioms and cultural norms and references involved.

Even if the translation is perfect and "real-time", it comes with a significant latency that will make any conversation less natural. Good for some situations while traveling, not something you would want to rely on for everyday life.

> China at least has begun cutting foreign-language programs because such AI translation is seen as the way of future. Once this tool becomes adopted enough societally, the learning of foreign languages is going to become a very niche hobby.

If this happens, professional or reliable translations will only be accessible to those who can afford/pay them, leaving everyone else stuck with the errors produced by LLMs.

To use machine translation, one have to know the language to review the output; otherwise, you're doomed to mistakes. Whatever you do with LLMs, the same thing will happen.

I would name all the marketing surrounding the A"I" as the LLM's blindness virus, or something similar.

This has been said for ages and, as a person in a very multilingual environment, I still cannot see it happening, no matter how good the translations are. I may be wrong, but talking through translation earbuds seems dystopic and uncomfortable.

China does this, because significant amount of foreign companies have left or plan to leave China.

> Once this tool becomes adopted enough societally, the learning of foreign languages is going to become a very niche hobby.

That could a long time or it could be a very different implementation than the one you describe. Half of the world knowing 2 or more languages and that has been growing over time. I don’t see the evidence that technology will soon close the gap of speaking and understanding another language when in comes to communicating with family, music, business, participating in community events, volunteering, or even intimacy.

With AI there will always be people who learn more, faster using AI. And there will be people who use AI to avoid learning. When moving abroad, I hope folks will do the former (and the latter as tourists).

When I move back to Japan I'll wear something like Even Realities glasses, and when unknown vocabulary gets used, display that. Personally I think this will help me learn better than before. But let's wait and see!

I'm very hopeful about learning-acceleration tools. Just think what will be possible with Neuralink.