Wikipedia:Reference desk/Archives/Humanities/2022 June 26

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June 26

Oldest 25%, 20%, 10%, 5% and 1%

I would like to know what age you would have to be to be in the oldest 25%, 20%, 10%, 5%, and 1%. What I mean by that is how old would you have to be so that 75%, 80%, 90%, 95%, and 99% is younger than you? Please cite sources. Interstellarity (talk) 13:06, 26 June 2022 (UTC)

You could start by Googling "population by age group" and zero in on what interests you. For example, the U S Census Bureau. If they don't have percentages but do have counts for each age group, you could easily work it out for yourself. --←Baseball Bugs ^{What's up, Doc?} carrots→ 13:15, 26 June 2022 (UTC)

@Baseball Bugs: Thank you for your answer. I would be interested in the world’s population by age. I’ll look it up. Interstellarity (talk) 13:46, 26 June 2022 (UTC)

There's a graph of it at the top of Demography. The links lead to this population pyramid at the UN site and this PDF with more detail about population figures per age group, in numbers. Though actually the pyramid breaks the population down into 5-year age ranges, while the numbers lump the 40 years from 25-65 together into one figure, which makes me wonder about the methodology (and makes it harder to answer your question about percentages, because I'd have to estimate figures from the graph, if those are even real and not extrapolated).  Card Zero  (talk) 13:58, 26 June 2022 (UTC)

@Interstellarity: Percentages vary a great deal over time, and by country or region. This doesn't directly answer your question, but see Demographics of Japan#Population for an animated gif showing how the population pyramid in Japan has changed dramatically since the late 19th century. Compare the image at the top of that article, with the vastly different one at the top of Demographics of Morocco. So, your question is very much dependent on time and place. Mathglot (talk) 18:53, 27 June 2022 (UTC)

Back around 2007, we were taught the world population for 100 and up is 450,000. Of course the world pop has since changed. 67.165.185.178 (talk) 22:50, 27 June 2022 (UTC).