AFAIK very little research effort has gone into attacking ageing itself. It's fair enough to consider someone like Aubrey de Grey as fringe, but where are the non-fringe researchers? How come it's not worthy of mainstream attention?
So, the key thing in the OP is that in 1900 once you had reached 65 you were probably good for about the same number of years as you are now if you reach 65
but
your chances of seeing 65 in 1900 were very much lower.
While commonly believed this is not true. Since 1970 changes in life expectancy in industrialised nations have been pretty largely driven by extensions in life for older people.
When we reach 65 we now go on for longer and it is this rather than anything pre 65 which is now driving increases in life expectency.
Oh, meant to mention the huge disparities and injustices these data throw up. Places like Afghanistan have infant mortalities now that are up where UK rates were in 1900. And even within the UK things vary - (period) life expectancy for a newborn boy in Glasgow City is 71.6, but for a newborn girl in Kensington & Chelsea it's 89.8.
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but
your chances of seeing 65 in 1900 were very much lower.
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When we reach 65 we now go on for longer and it is this rather than anything pre 65 which is now driving increases in life expectency.
J.R. Wilmoth / Experimental Gerontology 35 (2000) 1111±1129
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of all the advances that have increased life expectancy, 80% have been in civil engineering. Most particularly, sanitation and water treatment.
20% are medical.
that's an estimation by - if I remember rightly - a previous head of the Royal College of Physicians. Who was not a civil engineer.
[figures pulled from my unreliable memory]
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