I believe in the First Earth Age because
when God is questioning Job in Job 38:7 When the morning stars sang together, and ALL the sons of God shouted for joy? I have not found a better explanation, when God is telling us that He witnessed us ALL TOGETHER?
when God is describing the "Dinosaur with the tail like a cedar tree" I meant "Behemoth" we have not had them in the past 6000 years, since ADAM and EVE were formed and science says they are much older, I do not have another explanation
When I realized Satan was ALREADY BAD in the garden of Eden, and Satan had been called Lucifer a protecting cherubim and made the full pattern by God, there was a whole life before that point.
Also, in Isaiah where GOD does state MOST INFATICALLY at 45:18 For thus saith the LORD that created the heavens; God himself that formed the earth and made it; he hath established it, he created it not in vain, he formed it to be inhabited: I am the LORD; and there is none else.
and he turns right around and in Gen 1:2 to state "And the earth was without form, and void; and darkness was upon the face of the deep. And the Spirit of God moved upon the face of the waters"?
And that this, without form and void EARTH God starts out working with in the beginning of this age, can be no other that the one He rendered basically dead, yet not a full end to from before.
This also, NOAH was ALIVE, in the ark and with family for that flood, where day and night still existed, the flood that was to rid the earth of the fallen angels and their offspring
which is in direct conflict with
Jeremiah 4:23 I beheld the earth, and, lo, it was without form, and void; and the heavens, and they had no light.
24 I beheld the mountains, and, lo, they trembled, and all the hills moved lightly.
25 I beheld, and, lo, there was no man, and all the birds of the heavens were fled.
THERE WAS NO MAN, let alone a woman and THE HEAVENS HAD NO LIGHT, and that sounds just like Gen 1:2 which would mean that this had to have happened BEFORE because it certainly hasn't happened since,
and put together with
2 Peter 3:5 For this they willingly are ignorant of, that by the word of God the heavens were of old, and the earth standing out of the water and in the water:
2 Peter 3:6 Whereby the world that then was, being overflowed with water, perished:
2 Peter 3:7 But the heavens and the earth, which are now, by the same word are kept in store, reserved unto fire against the day of judgment and perdition of ungodly men.
Leaves no other possibility.