Why Abraham Laughed and Was Only Ten Years Older Than Sarah

Midrash Aggadah, Genesis 17:17

"And Abraham fell on his face and laughed" (Genesis 17:17). For so he said in his heart, that the Holy One, blessed be He, had done this thing, and it was a wonder to all, and they said: Who has seen such a thing, that Abraham, a hundred years old, should beget a child? "And shall Sarah, who is ninety years old, bear a child?" (Genesis 17:17). From here we learn that Abraham was not older than Sarah by more than ten years.

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