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CellBioGuy comments on A Map of Currently Available Life Extension Methods - Less Wrong Discussion
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This is a little misleading because low life expectancy at birth was to a large extent a function of very high infant mortality. It is true that even if one takes into account infant mortality (for example by looking at life expectancy at three years of age) that life expectancy has gone up. However, this is primarily average life expectancy. Maximum life expectancy has barely budged. This is sometimes referred to as rectangularization of mortality curves.
I do think it is likely that we are going to see substantial improvements in maximum life expectancy in the next few years, but the change in life expectancy up to this time isn't really indicative of it.
Indeed, if you reached age 10 in the Roman empire you'd probably reach age 50 and if you reached age 20 your expectancy is near 60.
Infectious disease has always been awful.
And again, indeed the age of the OLDEST people has barely budged since ancient Greece.