As far as I know obviously the flat earth is only 6000 years old. In fact scientific evidence shows that the culture the Flintstones lived in was a flat earth!Darwin's theory of evolution and Genesis creationism are entirely compatible. Genesis serves to explain how life came to be. Evolution serves to explain how life changed once it came to be.
The only conflict that exists is between Darwin's theory of evolution and young-earthism. Any theory that places the earth's age at less than a few dozen millions of years has an uphill battle to explain and endless plenitude of physical empirical evidence to the contrary. Nontheless, no explanation is required for one to believe whatever one wants to believe.
![Grinning face with big eyes :smiley: 😃](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f603.png)