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What we know about the age of the human species, and other life, the earth, the universe etc. depends on so many guesses that we know essentially nothing.
Specifically, I think that elements and materials may have changed some of their properties and behaviour at some time in the past.
We do not know that. Most people just assume they have remained constant at all times. And we build quite many of our guesses on this assumption.
If, for example, C14 has changed it's disintegration rate at some time, then quite many of our guesses would be very wrong.
I don't think it's documented as happening to an element, but some compounds have changed their properties due to disappearing polymorphs.