Genesis 15:3,6
And Abram said, Behold, to me you have given no seed: and, see, one born in my house is my heir.
Torrey's Topical Textbook—AKJV

Genesis 17:17
Then Abraham fell on his face, and laughed, and said in his heart, Shall a child be born to him that is an hundred years old? and shall Sarah, that is ninety years old, bear?
Torrey's Topical Textbook—AKJV

Luke 1:18
And Zacharias said to the angel, Whereby shall I know this? for I am an old man, and my wife well stricken in years.
Torrey's Topical Textbook—AKJV