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this still does not answer the question why creatures were created with built-in decay in the first place, long before mankind.


No it doesn't, you are correct as far as I can see right now.

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However, science knows mechanisms of aging - one of them is a cell reproduction limit timed by the length of telomers.

OK. Do you know of any fossil evidence which shows pre-adamic(pre-4000 bc)creatures aging? It doesnt sound like the length of telomers is something that would readily fossilize.

In other words, where did you get the idea that there is evidence of aging in fossil records before 4000 bc? (Of course embryo to adult wouldnt be the type of aging required)