| http://www.w3.org/ns/prov#value | - If they mean in the US but they mean among the set of people who were 70 in 1961, there was a higher percentage of people who made it to 90 in 1981 than there was of people who made it to 90 in 2001 who had been 70 in 1981 I am not sure how you would measure that, or how definitive it would be of anything except itself.
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