In before the insistence that they can’t be more than 6021 years old, and the assertion the debble or God Himself made them to mess wid our haids...
Id have to rely on faith that these fossils are 518000000 years old.
We ahev it on good authority that God does not create things to trick us, so the measuring systems we have tell us that the planet is about 3 1/2 billion years in existence.
Now if the 'constants' we depend upon to set our gauges are changing or have had major changes, then all bets are off. But my guess is that even the speed of light in a vacuum has slowed considerably since the beginning of the Universe. The rules of entropy tell us the Universe is cooling down, so the whole shebang has to be older than 6000 years.