The earth was not created at the creation of our world. The earth already existed in timeless time, hidden under waters.
In the story of the Appearance of the Earth, we may realize or understand that the body of waters which Jesus used to carve a world in between to host us, had already been there when Jesus illuminated the waters.
The waters and the earth which the waters submerged had existed before the creation of our solar time.
If you can understand it, there are more than one creations.
There was the creation of the waters upon which the Holy Spirit was moving and there was the creation of our hosting world out of the already created waters.
Jesus is hosting us inside of an already created world, the world of the body of waters which Jesus split to create our young world out of the old world of those waters.
It is to be understood that all the elements of our universe in between the timeless waters, are not older than the biblical age of our world from the first man and woman until today. All the elements of our universe are just less than a week older than each other, except the waters and the earth.
So far up to the third day, Jesus did not call anything into existence except His light.
So far, on the third day, before the reckoning of our solar time, Jesus had been working with what was already there, which His light revealed: the leftover waters (the sea) and the earth under the waters.
Jesus adorned the emerged earth with 'grass, herbs yielding seed, and fruit-trees bearing fruit after their kind, wherein is the seed thereof (Genesis 1:11)',
Now, how old are the waters and the earth per the reckoning of our solar time?
Very, very, very old! The waters and the earth are not as old as the biblical age of their inhabitants.
Bible Science implies that the timeless age of the waters and the earth can be as any human science guesses it to be: gazillion, trillion, billion et cetera.
Jesus did not make the Angels and the host of heavens and mankind at the same time when He fashioned man.
If human science can use the elements in the core of the earth to calculate the age of the timeless earth, let them come up with whatever age that their science can come up with.
We just have to understand that the age of the earth and the age of the waters began way before the creation of our solar time, that is, in a timeless age.
Unfortunately, the day will come when the sea and the earth will be no more because the earth will be totally burned out, according to the word of God in Isaiah and in Revelation (Apocalypse) 21:1 to give way to a new earth which Jesus will create.
The sun had not still been to the scene yet to illuminate the earth.
Genesis 1:9-13 ASV
(9) And God said, Let the waters under the heavens be gathered together unto one place, and let the dry land appear: and it was so.
(10) And God called the dry land Earth; and the gathering together of the waters called he Seas: and God saw that it was good.
(11) And God said, Let the earth put forth grass, herbs yielding seed, and fruit-trees bearing fruit after their kind, wherein is the seed thereof, upon the earth: and it was so.
(12) And the earth brought forth grass, herbs yielding seed after their kind, and trees bearing fruit, wherein is the seed thereof, after their kind: and God saw that it was good.
(13) And there was evening and there was morning, a third day.
Isaiah 65:17 ASV
(17) For, behold, I create new heavens and a new earth; and the former things shall not be remembered, nor come into mind.
Isaiah 66:22 ASV
(22) For as the new heavens and the new earth, which I will make, shall remain before me, saith Jehovah, so shall your seed and your name remain.
Revelation 21:1 ASV
(1) And I saw a new heaven and a new earth: for the first heaven and the first earth are passed away; and the sea is no more.
Just overcome Satan to be there to witness it (Revelation 3:21).