Our solar system dates about 4.5 billion years. Earth's crust about over 3 billion. Our know universe about 13.7 something billion years. I suspect it is older. Genesis 1:1.
I also believe Genesis 1:3-31 to be literal 6 earth days. Day 1, God lit up our Sun. Day 4. The Sun, Moon and stars became visible in our Earth's sky.
What I personally believe being a Christian since 1962. No one needs to agree with my view.
Genesis is a GOD's Plan that was revealed to Moses around 2.500 years after Adam.
Genesis was/ is a Plan of GOD to restoration or restitution of all things-Acts 3:v.17 to 26. This GOD's Plan has nothing to do with creation, but exclusively to a restitution of all things after an undesirable occurrence or evil event in the Garden of Eden.
In fact, since the beginning GOD planned to make four heavens and the earth(small letter) as is written in Genesis 1:v.1.
The age of Planet Earth or even the Universe as a whole are from about billions years ago of course. In general, people and even scientists when they read Genesis they confuse themselves,
they confuse Earth(Planet) with earth(Israel, the dry land, the clay, whose nation(the earth) was without form, and void in the first Day, of course(Genesis 1:v.1), because Israel was made in the third Day, more precisely between years 2000-3,000 after Adam, exactly in the midst of the third millennium or 3rd Day).
The misinterpretation of them on Genesis is because they don't understand the language of GOD, the Creator, only the language of men, IOW their thinking is from a human perspective, not from God’s perspective, and that's where brain confusion begins.
That said, based in the Word of God, the source of the truth, on God's six Days of creation and one Day of rest (a total of seven days) plus the Scriptures that teach that one Day is with the Lord as a thousand years(Psalm 90:v.4; 2Pet.3:v.8; Heb.4:v.4), so MANKIND would go through six God Days of 1,000 years each (a total of 6,000 years) plus a Millennium of 1,000 years rest (now a total of 7,000 years).
So, in accord biblical Chronology, we can number our days, beginning in Genesis chapter 5, as the table below:
PERIODS OF BIBLICAL TIMES ----------------- DURATION
I - From Adam to the Flood--------------------------1,656 years
II - From the Flood to Abraham----------------------.427 years
III - From Abraham to Exodus------------------------430 years-Gal.3:17
IV - From Exodus to king Saul --------------------- 396 years
V - From Saul to the fall of Jerusalem -----------. 508 years
VI - From the fall of Jerusalem to Jesus --------. 587 years
Thus, from Adam to the 1st coming of Jesus ---4.004 years
From Jesus to our days (Christian Calendar)---. 2.021 years
Total from Adam to our days ------------------------ 6.025 years
VII period - Millennium of Christ- or the Lord's Day
JESUS- the Greater Light, Genesis 1:v.16- came in the fourth Day or around 4,000 years after GOD started His works of restitution of all things-Genesis 1. From JESUS (fourth Day) until our days, have passed more TWO DAYS or 2,000 years (one Day with the Lord is as a thousand years), totaling 6 complete Days or six complete millenniums, or around 6.000 years, more precisely 6,021 years, according Christian Calendar pointing the year 2.021.
So, we have entered in the beginning of the first century of the seventh and last millennium, or seventh and last Day, the Lord's Day, the Millennium of Christ, the Millennium of Truth, the Millennium of Judgment, the Judgment Seat of Christ, the Millennium of Vengeance.
The END of all things arrived, as is written in 2Peter 3:v.7-8
7 The heavens (the first two heavens) and the earth (Israel-not the Planet), which are now, by the same Word are kept in store, reserved unto FIRE against the Day of Judgment and perdition of ungodly men.
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.