If you look at the question a little deeper however you understand that aging was not directly caused by God's "displeasure with humans" anyway. Aging itself was directly caused by Adam and Eve getting kicked out of the garden of eden and therefore being forever seperated from the Tree of Life. The inability to eat from the tree of life daily was what caused their bodies to die. The curse outlined in Genesis 3:13-19 didnt say anything about ageing.

It is true that "death" was the result of the curse, but it wasnt a physical death, but rather a spiritual death which had nothing to do with the bodies of Adam and Eve.

So therefore, the explanation of species ageing before mankind even existed was not due to a mistake mankind made, but rather due to the fact that the creatures didnt have access to the tree of life.