I wouldn't be at all surprised that there's going to be slowdowns of growth in various areas, some things are by definition going to be constrained in terms of space/resources. (e.g. growth of # home units in New York City) I don't think infinite liniear or infinite exponential growth is the expectation.
That having been said, for this particular example (life expectancy) it's typically a bit better to look at life expectancy at age x, often 5, 10 or 15 are chosen.
It's because infant mortality used to be sky-high, as 25% (one in four) in 1900 and 16% (one in 6) in 1950 worldwide, to < 2.9% today, with the best countries now around 0.2%.
If say one in four humans becomes virtually zero years old, that skews the average down a lot, e.g. from 65 to 40. But it doesn't mean that the average person who makes it through the first few years would've died at age 40.
That having been said, for this particular example (life expectancy) it's typically a bit better to look at life expectancy at age x, often 5, 10 or 15 are chosen.
It's because infant mortality used to be sky-high, as 25% (one in four) in 1900 and 16% (one in 6) in 1950 worldwide, to < 2.9% today, with the best countries now around 0.2%.
If say one in four humans becomes virtually zero years old, that skews the average down a lot, e.g. from 65 to 40. But it doesn't mean that the average person who makes it through the first few years would've died at age 40.
If we look at improvements of life expectancy for those who already raeached age 10, it looks like this and is a pretty straight line with fewer indications of slowing down. https://ourworldindata.org/grapher/life-expectancy-at-age-10...