Consider the cohort born in (say) 1900 in the US. Since they are all dead now, the following question makes sense: "how many years have those people lived, on average?"
[Note that this is a completely different question than "what was the life expectancy in 1900?". The latter you could answer in 1900 (the answer was 47 years, if my quick look on the internet gave a reliable source). But the question I ask can only be answered now.]
So I'd like to know: is the answer to this question readily available? If so where?
If not, where can I find sufficiently precise data about death each year counted by year of birth so that I can compute the answer -- not only for 1900 of course, but for as many years as possible.
Thank you for your help...