Micro-macro, who knows?
It's certainly extremely doubtful that the Erf is <8000 years old.
The Restaurant at the end of the Universe may explain it...
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Micro-evolution, which is variation within a species, can and does occur without any new genetic information being created. Existing genetic information is just being rearranged. Macro-evolution requires the continual creation of new genetic information. The rearrangement of existing genetic info cannot cause an insect to turn into a reptile or something.
But now you're off on the age of the universe.