It's hard to find statistics bout childlessness, rather than the birthrate.
Here are a few.
In the US, the percentage of women born in 1918 who never had children was 18%. In 2022 women who were 45-50 (so born around 1972-77) who were childless was 16.5%.
It's not a straight line, but it went *down* not up, overall. Right wingers and fertility worriers will look at the data only since the 70s and tell you it's all the fault of scary independent women.
It's bullshit.
https://www.pewresearch.org/social-trends/2015/05/07/childlessness/
https://population-europe.eu/research/policy-insights/childlessness
https://www.statista.com/statistics/241535/percentage-of-childless-women-in-the-us-by-age/