First we had a virgin getting pregnant. Now we have someone who is so old that she pulled a Sarah at the idea of having a child. How old? We don’t know, all we have is,
(Luk 1:7 KJV) And they had no child, because that Elisabeth was barren, and they both were now well stricken in years.I would suggest that being “well stricken” is old.
At the same time you need to think outside the box. Are there things that God cannot do? In our understanding, yes. God cannot make a round square. There might be some deep concept in some future form of physics where such a thing is postulated, just like mathematicians talk about the square root of minus one. But allowing an old woman to get pregnant is small potatoes after saying, “Let there be light” and deciding that a virgin would conceive.
Let Christmas be the time of the impossible for you. I have reason to believe that I might have been conceived on Christmas. It was not an answer to prayer because they were hoping for a girl. There are no reports on whether they were reading Luke 1 and 2.
May this be a season of miracles for you.
homo unius libri