That is completely false. Most of Earth's continental crust is more than 2.5 billion years old, with the oldest parts being 4 billion years old. Only Earth's oc

That is completely false. Most of Earth's continental crust is more than 2.5 billion years old, with the oldest parts being 4 billion years old. Only Earth's oceanic crust is young. We do find fossils everywhere. Not all rock types are conducive to fossil formation, and many parts of Earth are less explored than others, but there exists no region on earth without a fossil record. Evidence of humanity's existence would be clear in the fossil record for billions of years. Reinforced concrete, plastics, artificial ceramics, mined fertilizers, they would all be preserved over geologic timescales. On top of this, intelligence does not simply pop into existence - there would need to be many millions of years of fossil record showing the evolution of some intelligent lineage.