GOD'S WORD® Translation
So she became pregnant, and at the exact time God had promised, she gave birth to a son for Abraham in his old age.

American Standard Version
And Sarah conceived, and bare Abraham a son in his old age, at the set time of which God had spoken to him.

Berean Study Bible
So Sarah conceived and bore a son to Abraham in his old age, at the very time God had promised.

Douay-Rheims Bible
And she conceived and bore a son in her old age, at the time that God had foretold her.

English Revised Version
And Sarah conceived, and bare Abraham a son in his old age, at the set time of which God had spoken to him.

King James Bible
For Sarah conceived, and bare Abraham a son in his old age, at the set time of which God had spoken to him.

World English Bible
Sarah conceived, and bore Abraham a son in his old age, at the set time of which God had spoken to him.

Young's Literal Translation
and Sarah conceiveth, and beareth a son to Abraham, to his old age, at the appointed time that God hath spoken of with him;

Genesis 21:2 Additional Translations ...