1. The relevant texts are:
17:17 - "Abraham fell face down; he laughed and said to himself, 'Will a son be born to a man a hundred years old? Will Sarah bear a child at the age of ninety?'"
23:1 - "Sarah lived to be a hundred and twenty-seven years old."
25:20 - ". . . and Isaac was forty years old when he married Rebekah daughter of Bethuel the Aramean from Paddan Aram and sister of Laban the Aramean."
2. "The Lord appeared to Abraham near the great trees of Mamre while he was sitting at the entrance to his tent in the heat of the day" (18:1) and "So Abraham hurried into Sarah's tent. 'Quick,' he said, 'get three seahs of fine flour and knead it and bake some bread' (18:6).