Luke 1:18

And Zachariah said to the angel, Whereby shall I know this? for I am an old man, and my wife is far advanced in years.

Luke 1:34

Then said Mary to the angel, How shall this be, since I know not a man?

Luke 1:7

And they had no child, because Elizabeth was barren, and they were both far advanced in years.

Romans 4:19

and not being weak in faith, he regarded not his own body which had become dead, he being about a hundred years old, nor the deadness of Sarahs womb;

Treasury of Scripture Knowledge

Summary

And Zacharias said unto the angel, Whereby shall I know this? for I am an old man, and my wife well stricken in years.

Whereby

Bible References

Whereby

Luke 1:34
Then said Mary to the angel, How shall this be, since I know not a man?

For

Luke 1:7
And they had no child, because Elizabeth was barren, and they were both far advanced in years.
Romans 4:19
and not being weak in faith, he regarded not his own body which had become dead, he being about a hundred years old, nor the deadness of Sarahs womb;