You
You are correct. The age of the Earth is unknowable. There was indeed a restoration that was repairing some kind of catastrophic event. GOD doesn’t create things in confusion and chaos as the Hebrew words tohu and bohu that mean chaos, desolation or wilderness. Everything GOD creates is very good. Given your understanding that Earth existed prior to the Genesis narrative consider that the rest of what we know as the universe was not created until the 4th day; the sun, moon and stars. This would mean the Earth is the oldest thing in the universe. People think the light of that first day was the sun but this cannot be because it wasn’t created until the 4th day. Some say this was GOD being repetitive but this idea destroys the flow of the days HE gave. The first estate of the angels was the previous Earth in which one third of them left to ascend to GOD for the purpose of rebellion which failed and they were cast down on the Earth resulting in its devastation. The Genesis story picks up the narrative from there. People think I am crazy for saying this but that is par for the course so to speak. I get my information from someone that they do not know. Today men dig up bones and fossils of animals and vegetation from that original Earth and can determine that they are billions of years old, which is more correct than the 6,000 years idea. Science, if true will agree with scripture. Scripture says that when GOD speaks it is done, HE doesn’t wait for things because this would imply HE is limited by time, which HE is not. After repairing the damage caused by the angelic rebellion, on the 4th day, GOD spoke the rest of the universe into existence. Most people read the scriptures and gain next to nothing because they read with carnal thinking. A true Christian reads with spiritual thinking supplied by GOD to properly divide and comprehend the word of truth. Even the deep things of GOD can be understood by HIS elect saints.