You don’t know he didn’t create via larvae or eggs. The scripture is not specific. When I make a zip line out back (my honeydo today), I have to go through the process, buy parts, put together, clamp, pull, etc... Then when I’m done, I say “I made a zip line, there it is” to my boys. To the boys, if they don’t see the process, it appears with age, to me, I see the process.
From what I read, you just can’t say with or without age with certainty; the text is just too vague.
“You don’t know he didn’t create via larvae or eggs.”
Actually He created creeping things, they were creeping. Eggs don’t creep. Larva sort of do, but anyway. Scripture says He created creeping things.
My point remains. He created mature versions of plants, animals, AND mankind, indisputably. He did not create each item in its initial stage of life. Adam was upright, walking, talking, needed no care. He was an adult.
The birds were flying, not in their eggs or their nests. Etc.