How much will the population of China decrease in 20 years?

Everyone is lying with their eyes open. After 20 years, it will only be around 800 million, because at least 50% of people will be aging after 5060! After their two generations left, there were 708,090 only children, with two or three in the countryside at most. Now, ideas are changing. There are many single dog, and there are many childless people. According to my guess, after 2040, it is estimated that there will not be 654.38+0 billion people.