We are living in the second heaven and earth age. When Christ return on this Earth that will be the End of the present way of things and the beginning of a new heaven and new earth age after the surface of the Earth (Earth's biosphere) have been clean dissolved by fire after the tribulation events.
Revelation 21
4 And God shall wipe away all tears from their eyes; and there shall be no more death, neither sorrow, nor crying, neither shall there be any more pain:
for the former things are passed away.
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5 And he that sat upon the throne said,
Behold, I make all things new.
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And he said unto me, Write: for these words are true and faithful.
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The tree earth ages as mentioned in the scriptures.
2 Pet 3:5-13
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:
6 Whereby the world that then was, being overflowed with water, perished: (Greek-Destroyed, totally)
[This is the 1st earth age, NOT the flood of Noah's time! See (Jer 4:23-27) which speaks of this same event:" I beheld, and, lo, there was no man, and all the birds of the heavens were fled." (Jer 4:25) ]
7 But the heavens and the earth, which are now, (The present Cosmos) by the same word are kept in store, reserved unto fire against the day of judgment and perdition of ungodly men.
[This is the 2nd earth age]
8 But, beloved, be not ignorant of this one thing, that one day is with the Lord as a thousand years, and a thousand years as one day.
9 The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance.
10 But the day of the Lord will come as a thief in the night; in the which the heavens shall pass away with a great noise, and the elements shall melt with fervent heat, the earth also and the works that are therein shall be burned up.
11 Seeing then that all these things shall be dissolved, what manner of persons ought ye to be in all holy conversation and godliness,
12 Looking for and hasting unto the coming of the day of God, wherein the heavens being on fire shall be dissolved, and the elements shall melt with fervent heat?
13 Nevertheless we, according to his promise, look for new heavens and a new earth, wherein dwelleth righteousness. (KJV)
[This is the 3rd earth age, commonly called Heaven]