I took a look at your concerns.
I just read your concerns, and I don't know about your couple, and I think it would be biased advice. Please be aware of this before reading.
First, they're a married couple who haven't had a physical relationship for 4 years.
If you don't say that to your wife when you get married, it can also feel like bullying against your wife. It is said that they lost their confidence when they were young, but if that is still taking hold, please see a doctor carefully for treatment.
I think this is a case where treatment (including counseling) by a doctor is necessary.
Are you willing to fix it yourself? It's not like anyone can fix it. Please make sure you go to the hospital yourself.
My wife wants to have children, but I think she will be able to endure it well.
In the first place, there is a high possibility that your mother sees the reason you can't have children because your wife's body cannot have children, and if your wife receives such misunderstandings and is secretly blamed, you don't know how much mental pain you are experiencing.
Also, it doesn't take long for a woman to give birth to a child.
Giving birth for the first time and being in your late 30s must be quite physically difficult.
It also seems quite impossible for people in their late forties.
Giving birth is the most important thing, risking one's life.
I'm not a doctor, so I just looked up information, but it seems that the probability of having a child with a single sexual act is 20 to 30%, which is low even if you are aware of the day of ovulation.
Even so, I feel sorry for my wife.
It must have been painful, but if you don't say it straight to you, you're probably the type of person who accumulates dissatisfaction within yourself.
It would be nice if I didn't get sick or depressed, but...
At least I think you should clearly tell your mother that you haven't had a physical relationship for four years since you married your wife for your own reasons. Also to clear up misunderstandings about my wife.
Also, please be sure to go to the hospital.
You casually describe yourself as a “childless couple,” but can you understand that even that one word would deeply hurt your wife?
Please really care not only about yourself, but also about your wife.
I really feel sorry for my wife.