Take these threads with giant grain of salt though, they're far from thorough and some of them lack basic understanding of statistics. And I personally don't think the dataset (at least the sample) is actually random so not really a good representation of China's demographics.
https://www.reddit.com/r/China_irl/comments/vr214w/
https://www.reddit.com/r/China_irl/comments/vr2lij/
https://www.reddit.com/r/China_irl/comments/vqfwic/
Take these threads with giant grain of salt though, they're far from thorough and some of them lack basic understanding of statistics. And I personally don't think the dataset (at least the sample) is actually random so not really a good representation of China's demographics.