Interesting question I have never considered. We are given no indication how much time elapsed from Genesis 2:7 until Genesis 2:21 when the woman was created.
Given what we are told from Genesis 2:7 on, I would 'guess' based upon what little I know, Adam would have been mentally younger than 25, physically at least 21-25. He was to have a 'tough' time making ends meet after he directly disobeyed the Heavenly Father, and yet lived 930 years. So physically speaking Adam would by necessity had to have been in excellent physical shape. Mentally speaking he surely lived a long time regretting his disobedience.
I ask that question of myself and others for this reason: If God could create a man that, even though he was only a day old, he appeared in every way to be a full grown man (and all of the previous development time that would cause one to infer), why could he not create a planet that, the day after it was created it appeared to be “fully developed” (and all the previous development time that would cause one to infer).
OTOH, I think our current world really IS best explained by the movie “the matrix”. Think about it. Matter does not really exist. It is just “coagulated energy”. It is merely perceived to exist in the form we “see and touch” it.
IOW, I feel like we are basically the equivalent of a bunch of first graders, after our first exposure to a teacher telling us those points of light in the night sky are just suns a long way away, trying to explain everything.
We don’t know what we don’t know by so many orders of magnitude that these discussions sometimes actually make me laugh out loud. I’m not so much impressed with what we know as I am with so much that we DON’T know.