In this blog by the Our World in Data, Max Roser shows that with life expectancy having increased at all ages since the mid-19th century, the average person can expect a longer life, irrespective of what age they are. In previous centuries, life expectancy fluctuated between 30 and 40 years with no marked increase. Evidence for population health before modern times suggests that around a quarter of all infants died in the first year of life and almost half died before they reached the end of puberty. Life expectancy did not extend before the modern improvement in health. Since the late-19th century, however, life expectancy has doubled from around 40 years to more than 81 years at present.
https://ourworldindata.org/its-not-just-about-child-mortality-life-expectancy-improved-at-all-ages

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