lol. China can date it roots back to Noah. It is even mentioned in the OT. (they were called the land of sinim, who would come from the north (Is 49: 12) Which is proven to be CHina. The name sinim comes from the name sinite, which was one of the offspring of Ham, they were one of the people who came from the cannanites. It is known that many of these people migrated to Asia.
You can not prove it existed before the flood. You can not even prove the continents existed before the flood
All you can do is make a hypothesis based on someones ideas of how things happen, and how they are dated.
You were not there. Your scientists were not there So you CAN NOT know how things happened back then to determine how to tell how long ago they actually were. Your guessing, based on facts NOT KNOWN.
It take more faith to believe in your guess, than it does for us to believe in the word of God. Which tells us what happened.