And Zacharias said to the angel, "How shall I know this? For I am an old man, and my wife is well advanced in years."
Then Mary said to the angel, "How can this be, since I do not know a man?"
But they had no children, because Elizabeth was barren, and they were both well advanced in years.
And not weakening in faith, he did not consider his own body, already having been worn out (being about a hundred years old), and the deadness of Sarah's womb,