And they had no child By an extraordinary purpose of God it was appointed that John should be born out of the common and ordinary course of nature. The same thing happened with Isaac, (Genesis 17:17; Genesis 21:1-3,) in whom God had determined to give an uncommon and remarkable demonstration of his favor. Elisabeth had been barren in the prime of life, and now she is in old age, which of itself shuts up the womb. By two hinderances, therefore, the Lord gives a twofold, surprising exhibition of his power, in order to testify, by stretching out his hand, as it were, from heaven, that the Prophet was sent by himself, (Malachi 3:1; John 1:6.) He is indeed a mortal man, born of earthly parents; but a supernatural method, so to speak, recommends him strongly as if he had fallen from heaven

Well stricken in years - Old or advanced in life, so as to render the prospect of having children hopeless.

Both were now well stricken in years - By the order of God, sterility and old age both met in the person of Elisabeth, to render the birth of a son (humanly speaking) impossible. This was an exact parallel to the case of Sarah and Abraham, Genesis 11:30; Genesis 17:17. Christ must (by the miraculous power of God) be born of a virgin: whatever was connected with, or referred to, his incarnation must be miraculous and impressive. Isaac was his grand type, and therefore must be born miraculously - contrary to the common course and rule of nature: Abraham was a hundred years of age, Sarah was ninety, Genesis 17:17, and it had Ceased to be with Sarah After The Manner Of Women, Genesis 18:11, and therefore, from her age and state, the birth of a child must, according to nature, have been impossible; and it was thus; that it might be miraculous. John the Baptist was to be the forerunner of Christ; his birth, like that of Isaac, must be miraculous, because, like the other, it was to be a representation of the birth of Christ; therefore his parents were both far advanced in years, and besides, Elisabeth was naturally barren. The birth of these three extraordinary persons was announced nearly in the same way. God himself foretells the birth of Isaac, Genesis 17:16. The angel of the Lord announces the birth of John the Baptist, Luke 1:13; and six months after, the angel Gabriel, the same angel, proclaims to Mary the birth of Christ! Man is naturally an inconsiderate and incredulous creature: he must have extraordinary things to arrest and fix his attention; and he requires well-attested miracles from God, to bespeak and confirm his faith. Every person who has properly considered the nature of man must see that the whole of natural religion, so termed, is little else than a disbelief of all religion.

And they had no child,.... Son or daughter: and which was accounted a great infelicity: but this was not owing to the judgment of God upon them for any sins they had been guilty of, as the above character of them shows: and it had been the case of some righteous pairs before them for a great while, as Abraham and Sarah, Manoah, and his wile, Elkanah and Hannah:
because that Elizabeth was barren; so that it was peculiarly her case, and not Zacharias's: and though God had promised the people of Israel that there should be no male nor female barren among them, Deuteronomy 7:14 yet there were instances and exceptions to this general rule, as before mentioned, when it was the pleasure of God to make himself known, and magnify his power in the extraordinary conception and birth of any person; and therefore, though barrenness was reckoned a reproach to a person, there was, in this case, a particular hand of God, to answer a special purpose: the signs of sterility are, according to the Jews (b), when a woman had not breasts as other women have, her voice gross, so that it could not be discerned, whether it was a man's or a woman's, &c,
and they both were now well stricken in years; which made the conception and birth of John the more extraordinary, and even miraculous, and so the belief of it the more difficult; see Genesis 17:17 It may be literally rendered, "they had proceeded", or had far advanced "in their days": it is an "Hebraism", and answers to, in Genesis 18:11 where the Septuagint render it by the same phrase as here. The Mahometan writers Beidavi and Jallallo'din say (c) that Zacharias was "ninety nine" years of age, and his wife "eighty nine",
(b) T. Bab. Yebamot, fol. 80. 2. Maimon. & Bartenora. in Misn. Yebamot, c. 1. sect. 1. & Maimon. Hilch. Ishot, c. 2. sect. 6. (c) In Koran, c. 3.

So with Abraham and Sarah, Isaac and Rebekah, Elkanah and Hannah, Manoah and his wife.