Genesis 21:5

The Birth Of Isaac

⁴ And Abraham circumcised his son Isaac when he was eight days old, as God had commanded him. ⁵ And Abraham was a hundred years old, when his son Isaac was born unto him. ⁶ And Sarah said, God hath made me to laugh. Every one that heareth will laugh with me.

Abraham

Isaac

Genesis 17:17

Then Abraham fell upon his face, and laughed, and said in his heart, Shall a child be born unto him that is a hundred years old? and shall Sarah, that is ninety years old, bear?

Genesis 17:1

And when Abram was ninety years old and nine, Jehovah appeared to Abram, and said unto him, I am God Almighty; walk before me, and be thou perfect.

Romans 4:19

And without being weakened in faith he considered his own body now as good as dead (he being about a hundred years old), and the deadness of Sarah's womb;