I think you need to consider this logically as opposed to emotionally.
I can't have children naturally and IVF was ruled out. Early 40s now and even if there was some miracle available to me, I wouldn't chance it.
You can have a very fulfilling life without children. I'm sure you already now that and if it's not fulfilling at present, that's not due to the absence of children.
IMHO, the health risks to both you and any potential children are too high. You age and the risk factors will go against both of you. The clinic also will want you to use a donor egg. It won't be your biological child.
I normally hate when people suggest fostering or adoption when someone wants their own child but in this instance it's a very good next best alternative.
It eliminates the health risk for you and for the child. You will be healthier without an IVF treatment and the child is already born.
It genuinely could be great for both of you.
You do have my sympathy and I don't wish to be harsh but if this wasn't a priority for you in the last 20-30 years, then it cannot be one now. You were aware of the biological timeline. You chose to ignore it.
Surely every mother wants what's best for their child. You might need to reflect on thst a little more before making your decision.