Sarah was 90 years old when she gave birth to Isaac, according to the Bible in Genesis 17:17 and 21:5–7.

How old was Sarah when she gave birth to Isaac? ~~

Quick Scoop

Short, direct answer

Sarah was 90 years old when she gave birth to Isaac, while Abraham was 100.

This is highlighted in Genesis when Abraham marvels, “Shall Sarah, who is ninety years old, bear a child?”

A tiny bit of story

In the biblical narrative, Sarah had been barren her whole life and was already considered very old when God promised Abraham that she would still have a son.

Abraham is described as 100 at Isaac’s birth, and multiple commentaries and study resources note that this places Sarah at 90.

Because of the surprise and joy of such a late-in-life birth, they named the child Isaac, which means “laughter.”

Many modern explainers and trivia-style Bible sites also repeat this: Sarah was 90, Abraham was 100, and Isaac’s birth is framed as a miraculous fulfillment of a long-awaited promise.

Quick fact bullets

  • Sarah’s age at Isaac’s birth: 90 years old.
  • Abraham’s age at the same time: 100 years old.
  • Name meaning: “Isaac” is linked to “laughter,” reflecting both disbelief and joy.
  • Many Bible study sites and church articles today still highlight her age to emphasize the “miraculous” nature of the birth.

Small age reference table

[9][1][3][7] [5][7][9] [1][3][5]
Figure Age at Isaac’s birth Source note
Sarah 90 years old Implied from Genesis and repeated in modern commentaries.
Abraham 100 years old Explicitly stated around the Isaac birth narrative.
Isaac Newborn Named “Isaac” (“laughter”) at birth.

TL;DR

Sarah was 90 years old when she gave birth to Isaac, and this late age is central to how the story is told in biblical and modern discussions.

Information gathered from public forums or data available on the internet and portrayed here.