I'm a young-earth creationist. Will anyone give me tangible evidence to prove to me that old-earth is true?

No. A very logical answer to a logical question. Just because there is a burden of proof , doesn't mean that there is no God.

Thomas Edison had no proof for the light bulb , but somehow made one , and discovered that it could actually work. Actually , we have no burden of proof . You atheists say we live in a world where deities do not exist , it's your job to prove your right , and the burden of proof is on your side.

God is a concept. The burden is on people who claim something about it , but have no proof. I didn't claim anything about God , so there is no burden for me to bear.

We don't claim there is no God as a fact. We just profess that it isn't a requirement that such being exists and that there is no reason behind the asserion that it does since it is as good as an assumption as the next. I may claim the universe is in fact inside an Oyster, or Oyster like device, in the same way one can claim any god exists.

Given that there is no evidential necessity for a god like being it's existence or none existence is irrelevant to the nature of our physical and understandable universe.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.