The rocks it was discovered in are that age...............
Red Badger
Are you serious? How do they know the age of a rock? Do they have a birth certificate?
No, they believe the rocks it was discovered in are that age. None of us were actually here to witness those rocks being formed, and they do not have a datestamp on them.
This article highlights one of the pitfalls of basing science on the assumption of uniformitarianism, and geological dating is subject to the same kinds of pitfalls.