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Q: What is the Biblical age of the earth?
A: The biblical age of the Earth (using Scripture itself as a guide) is 6,000 years !
Beginning with the archeological landmark event of the fall of Jerusalem (which has now been corrected to 588 B.C., instead of 586-587 B.C.) and counting backwards the prophesied number of years between this event and the division of Solomon's kingdom (390 yrs. + 40 yrs., according to Ezek.4:4-7), brings us to 1018 B.C.
From the end of Solomon's 40-year reign to the start of the Temple in the 4th year of his reign takes us back another 37 years to 1055 B.C.
From the start of Solomon's Temple "in the 480th year" (1 Kings 6:1) back to the Exodus from Egypt (hence 479 years previous) brings us to near 1534 B.C.
From the Exodus out of Egypt to Abraham's entering Canaan from Haran was exactly 430 years to the day (Gen. 12:10/ Exod. 12:40/ Gal. 3:17), thus around 1964 B.C.
Since Abraham entered Canaan at age 75 (Gen. 12:4), he was born approximately 2039 B.C.
From Abraham's birth to Noah's grandson (Shem's son), Arpachshad's birth, 2 years after the Flood started, was 290 years (Gen. 11:11-26), this places the onset of the Flood at around 2331 B.C. [definitely 4,300-4,400 years ago].
The genealogy of Genesis 5:3-32 precludes any gaps due to its tight chronological structure and gives us 1,656 years between Creation and the Flood, thus bringing Creation Week back to near 3987 B.C. or approximately 4000 B.C.
Therefore, the biblical age of the Earth (using Scripture itself as a guide) is 6,000 years !! Mankind did not evolve 4 million years ago on an Earth which is 4.5 billion years old in a universe which was "big-banged" into existence 18-20 billion years in the distant past. Jesus Christ, the Creator Incarnate, said He made mankind male and female in the beginning (Mark 10:6), and that when the heavens and the earth were commanded into being (Gen.1:1), they "stood up together" (Isa. 48:13) not billions of years apart !!