Easy. Use the drifting speed of continents, and then date back. You don't even need to age the rocks for that.

While at it, when a aging method for rocks says this stone is 200 million years old AND the continental drift says the same AND radio carbon method says the same AND the layering of the stones says the same, THEN it is very likely that this rock is 200 million years old. And when NO fact points in another direction, then it is very unlikely that this rock is just a few thousand years old.

You still miss the masses of facts and evidences that nowadays exists to prove or disprove something. Same ratio than between one book and library over library i would say