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✦ Question 008 ✦

How old was Sarah when Isaac was born?

Sarah Leading Hagar to Abraham — Matthias Stom, c. 1638
5 refs
Scripture
90 years old
The answer
2066 BC
On this timeline
Certain
How sure?
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The Short Answer

Ninety years old — and Abraham was one hundred. The Bible states it plainly (Genesis 17:17), and the whole story turns on it. Sarah was so far past the age of motherhood that when God promised her a son, she laughed. God's answer was to name the boy after the laugh: Isaac means "he laughs."

How sure are we? Certain — Scripture gives the numbers directly
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Key Scripture

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Genesis 17:17 — the numbers, stated plainly
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“Then Abraham fell on his face, and laughed, and said in his heart, "Will a child be born to him who is one hundred years old? Will Sarah, who is ninety years old, give birth?"”
Genesis 21:6
Read →
“Sarah said, "God has made me laugh. Everyone who hears will laugh with me."”
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Watch

Overview: Genesis 12–50
BibleProject
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But Did People Really Live That Long?

The ages are the point
the Bible presents them as extraordinary, not normal
  • ✓Even in the story, 90 is impossibly old to give birth — that's why Sarah laughs
  • ✓The text treats it as a miracle, not everyday biology
  • ⚠Skeptics read the long lifespans as symbolic; the text presents them as real years
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From the Collection

Sarah
character profile · 2156–2029 BC
→
Birth of Isaac — 2066 BC
see it on the timeline
→
Abraham
character profile · 2166–1991 BC
→
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Why It Matters

“Sarah's age is not a detail to explain away — it's the engine of the story. A nation born from a womb that was 'as good as dead' (Hebrews 11:11-12) was God's way of saying: this family exists because I keep promises, not because biology cooperated.”

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