Increase of life expectancy in the majority of the most developed countries slow down in the last decade. Life expectancy for general population in them is already near the limit, that is determine by human genetics. And every other year is achieved with more and more effort - linear extrapolation is not suitable here. Technology of life extension, if it is appear, will yet not be accessible for general population and will not yet give effect to general statistics. I suppose that, possibly, some micro-country, like Monaco or San Marino, in some year before 2040 will touch 89 milestone, but I don't believe in taking the bar of 90 years before 2040.

I hope that I'm wrong.

UN, World Population Prospects (2024) update for 2023: Monaco back above its prepandemic level (86y): https://ourworldindata.org/explorers/population-and-demography?facet=none&country=~OWID_WRL&hideControls=true&Metric=Life+expectancy&Sex=Both+sexes&Age+group=At+birth&Projection+Scenario=None

However, Monaco's LE has only grown by 2.5 years over the past 16 years. South Korea, at 84, increased its LE by 4 years over the same period. So, if we assume the same trends over the next 16 years, Monaco and South Korea might reach 89 by 2040.

Actually the UN forecasts Monaco #1 in 2040 at 88y: https://ourworldindata.org/grapher/future-life-expectancy-projections?tab=chart&country=USA~ARE~FRA~CHN~KOR~MCO

@jonsimon Does Monaco count?

linear extrapolation of japan falls far short

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