The population of China is, at PRESENT, approximate 1.4 BILLION people.
And declining. China’s population in 2100 is projected to be below 800 million, as stated in this article:
https://www.pewresearch.org/short-reads/2022/12/05/key-facts-about-chinas-declining-population/
Of course, such long-run demographic projections are highly speculative, but they are based on assumptions about China’s per capita income, the number of prime-age females, and ultimately future fertility rates.