OP, I never succeeded in having children, and had IVF 3x and IUI x2. I’m now 58. I’ve had 2 husbands, but single for the past 16years.
Yes, the feeling you describe does fade, and becomes more of an occasional, slight, melancholy wish, especially as most of my friends are now at the stage where grandchildren are appearing. All the friends without children have partners. So I think I have an inkling of what you mean.
I think the biggest challenge is people saying things which bite without any intention to do so, My friend is waiting excitedly for her 1st grandchild to be born next month, and has been regaling me with every step and appointment. I certainly don’t want to make her choose her words, because it IS a wonderful thing for her, but when she told me that having a ‘bébé’ (what she calls it) is a very difficult thing to go through, I thought, well, not having a baby is pretty difficult too. I know from experience the dynamic changes when these life changes happen, so I’ll be put in the back burner as a friend for a while. Which is fine, I have other friends and concerns.
Ride it out, if you’re sure you don’t want IVF. I’ve enjoyed my friends’childen, and am aunty to loads. Life is good, as love and joy are always possible with a bit of self knowledge. Good luck 💓💐