Most of the people I've met who actually believe the earth is only 4,000 years old think that it was created already old [1]. They usually start with something

Most of the people I've met who actually believe the earth is only 4,000 years old think that it was created already old [1]. They usually start with something like: Did the first created tree have tree rings?; did Adam and Eve have belly buttons? etc... They believe that the answer to those questions is probably yes, so the theory is that the earth was created similarly. At that point they're not really making any refutable scientific claims. Unlike the flat earth people who are making refutable scientific claims that almost anyone can refute for themselves. [1]. I have also met people who believe that there is just not enough evidence for any kind of evolution. However, even that position is much more defensible than the flat earth position. If only because there is more evidence that the earth is round readily available to people without specialized knowledge, than there is for evolution. A layman can't observe evolution, the way they can observe that the earth is a sphere.