Your answer may be correct but it is not an answer to my question of YEC folk is why did God create world that looks so old if it is not?
The Earth looks spry and young. It's backed up by observable science. Maybe the people on it aren't the greatest because of sin. God laid out how he created the Earth and universe and then the evolutionists made up stuff to contradict every single thing he said in the first two books of Genesis. That has to be more than a coincidence.
I mean I'm not saying they did it on purpose, but evolution is based on what people write. It's like Satan guided these people to contradict every single thing that God wrote. It's Satan's antiGenesis.
For example, God tells us that the Earth wasn't the same in the past as it is today. We had Noah's Flood and that changed everything. OTOH, evolutionary thinking tells us the present is the key to the past with uniformitarianism.