How old is the earth? And how much should the answer divide us?
Few questions get believers shouting at each other faster than the age of the earth. One side hears “old earth” and assumes the other has caved to the culture. The other side hears “young earth” and assumes the first has buried its head in the sand. Both assumptions are usually wrong. There are God-fearing, Bible-honoring Christians on each side of this line who hold an inerrant Scripture in one hand and the created world in the other. Today we look honestly at old-earth creationism — what it actually claims, where it stands on solid ground, and where it must never cross the line.
Let us begin where every faithful Christian begins, because the foundation is not in dispute.
In the beginning God created the heavens and the earth.
Genesis 1:1 (NASB1995)
The Ground We All Stand On
Before a single word about days or ages, mark the common ground, because it is far larger than the disagreement. Every biblical creationist — young earth and old earth alike — confesses the same non-negotiables. God created out of nothing, by His word, not from pre-existing matter.
By faith we understand that the worlds were prepared by the word of God, so that what is seen was not made out of things which are visible.
Hebrews 11:3 (NASB1995)
Both camps confess a real, historical Adam, specially created by God, not descended from a population of pre-human animals. Both confess a real Fall, a real first sin, and a creation now groaning under its consequences. Both reject the idea that blind, undirected processes can account for life. The argument we are about to describe is a family argument among people who agree on creation, the Creator, Adam, and the Fall. Keep that in view, because the noise online would have you believe the two sides worship different Gods. They do not.
The Old-Earth Case
Old-earth creationism argues that the universe and the earth are ancient — billions of years old — and that this is fully compatible with a high view of Scripture. Its strongest argument is textual, not scientific. The Hebrew word translated “day” in Genesis 1 is yom, and yom carries a range of meanings even inside the creation account itself. In Genesis 1, it labels the daylight hours and a numbered day; just a chapter later, in Genesis 2:4, the same word sweeps up the entire creation week into a single “day.” If the word flexes that much in two chapters, the old-earth reader argues, we should not force it into twenty-four hours by reflex.
The day-age view takes the six days as six sequential epochs of God’s creative work. It points to the way Scripture itself treats God’s relationship to time:
For a thousand years in Your sight are like yesterday when it passes by, or as a watch in the night.
Psalm 90:4 (NASB1995)
But do not let this one fact escape your notice, beloved, that with the Lord one day is like a thousand years, and a thousand years like one day.
2 Peter 3:8 (NASB1995)
The old-earth Christian adds a second argument from God’s own character. The same God who wrote Scripture made the heavens, and the heavens are not silent — they declare His glory. If the rocks, the light from distant stars, and the layers of the earth all testify to great age, the old-earth believer says, then reading them honestly is not surrender to unbelief; it is refusing to make God’s two books contradict each other. He insists the conflict is not between the Bible and the world, but between one interpretation of Genesis and one interpretation of the data.
The Young-Earth Answer, Stated Fairly
The young-earth creationist is not persuaded, and his objections deserve to be heard at their strongest, not caricatured. His first argument is the plain reading. Each creation day is bounded by “there was evening and there was morning,” ordinary language for an ordinary day, and each is numbered. When God wrote the fourth commandment in His own finger, He grounded a literal seven-day week in the creation week:
For in six days the LORD made the heavens and the earth, the sea and all that is in them, and rested on the seventh day; therefore the LORD blessed the sabbath day and made it holy.
Exodus 20:11 (NASB1995)
His second argument is weightier still, and every old-earth Christian must reckon with it honestly: the problem of death before sin. Scripture says death entered the world through Adam.
Therefore, just as through one man sin entered into the world, and death through sin, and so death spread to all men, because all sinned.
Romans 5:12 (NASB1995)
If the earth is billions of years old, the young-earth believer asks, then hundreds of millions of years of animal death, disease, and predation occurred before Adam ever sinned — and how can a creation God called “very good” be built on a graveyard? It is a serious question. The honest old-earth answer distinguishes human death, which Romans 5 ties directly to Adam’s sin, from animal death, and argues the “very good” creation was good for its purpose, not free of all physical death. Whether that answer fully satisfies is exactly where the family argument lives. The point here is that it is an argument between people who both take Romans 5 as the literal word of God.
The Line That Must Not Move
So where is the real boundary? Not at the age of a rock. The boundary is Adam and the Fall. The reason old-earth creationism remains inside the household of faith while theistic evolution wanders out of it is that old-earth creationism keeps a historical Adam, specially created, and a historical Fall that brought sin and death. The moment a view dissolves Adam into a metaphor, or makes death a neutral engine of progress that God used rather than an enemy sin unleashed, it has cut the cord that holds Romans 5 — and with it, the logic of the gospel itself. If there was no first Adam who fell, there is no need for a last Adam who saves.
Then the LORD God formed man of dust from the ground, and breathed into his nostrils the breath of life; and man became a living being.
Genesis 2:7 (NASB1995)
How to Hold This
Here is the call. On the age of the earth, hold your view with conviction and your brother with charity. This is a question on which sincere, Scripture-submitted believers have landed in different places for a long time, and the gospel does not rise or fall on a number. Study the text. Learn the Hebrew. Weigh the arguments. Come to a settled position. But do not make a test of fellowship out of a question Genesis leaves room to discuss, and do not let the world watch the church devour itself over the timeline while the lost stand outside wondering if anyone here actually knows the Creator.
Then guard the line that actually matters. A real Creator. A real Adam. A real Fall. A real death that a real Savior conquered with a real resurrection. Whether the days were ages or twenty-four hours, the same God spoke, the same man fell, and the same Christ came to undo it. Hold the timeline humbly. Hold the gospel with everything you have.
Teaching the Word. Watching the Times.
— SmithForChrist