I am interested in understanding how the global population pyramid has changed in the last couple of centuries.

I have two questions:

1) Has this been calculated? Are there estimates of population pyramids from the 19th century? Or from the beginning of 20th century? The earliest I have seen is 1950 (below).

2) If it hasn't been done, how can I construct it? It should be possible to model the population dynamics using birth and death rates (I would be surprised if this hasn't been done, as it has many applications outside of demography - e.g. economics).

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    $\begingroup$ I'm voting to close this question as off-topic because it is not a question about Biology in the terms of SE Biology. $\endgroup$ – David Sep 5 '17 at 10:27
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    $\begingroup$ @David: I have edited the question to emphasise the population dynamics aspect. Similar questions have received answers, e.g. here: biology.stackexchange.com/questions/36715/… $\endgroup$ – EOO Sep 5 '17 at 13:21
  • $\begingroup$ Also this one here: biology.stackexchange.com/questions/32981/… $\endgroup$ – EOO Sep 5 '17 at 13:22
  • $\begingroup$ Just because people answer questions that are not about biology sets no precedent. The site is adminstered by its users and not everything that should be is caught. I just call them as I see them. It will take another four like-minded reviewers to put your question on hold. They may not materialize. $\endgroup$ – David Sep 5 '17 at 15:29
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    $\begingroup$ I am voting to close because it is a question of geography, not Biology. $\endgroup$ – Remi.b Sep 6 '17 at 11:33