My fiance wants kids, but I may be too old to have them. I love him/want to be with him, but I don't want to deny him a child. What should I do?

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My fiance wants kids, but I may be too old to have them. I love him/want to be with him, but I dont want to deny him a child. What should I do?
I'm a 42 year old woman engaged to a 26 year old man. I know there's a big age gap, but most of the problems that come with dating a younger guy don't apply to him. He's very mature, he's a college grad with a high paying job, he's responsible, and he's very comfortable with commitment. In fact, most of the age-gap differences in our relationship have actually been positive ( less baggage, more energetic, more stamina in bed, etc.)

Nonetheless, there is one major potential problem: kids. I know he wants to be a dad. In a way it's not a problem as I would love another child (The only reason I didn't have another is my ex didn't want it). I take very good care of myself physically/have a lot of energy so I don't think I'd have the typical problems associated with being an older mom. However, I am concerned about my ability to get pregnant. The doctor told me I've got a 10%-20% chance of getting pregnant each month and warned me at my age 40%-50% of pregnancies result in miscarriages.

I know there's still a realistic chance I could get pregnant, but there's also a realistic chance I won't. We've talked about this. He's told me that he loves me and will want to stay with me no matter what. However, I'd still know that in a very real sense I denied him the opportunity of fatherhood. How could I deny that to him? It's tearing me up inside because, even though I love him so much, sometimes I think it would be better for him to leave me for a younger woman who has a much greater chance of giving him a child. I've mentioned this to him before. He shut it down immediately and told me we can make this work/shouldn't quit/he wants to be with me. However, if this doesn't work out will he feel deep regret years down the road when he's childless and didn't have to be?
How do I handle my fears of possibly not getting pregnant? If I don't get pregnant should I leave him so he does have the opportunity to be a dad? If not what's the best thing for me to do at that point?
Updates
+1 y
Just to clarify I am off birth control, we are having frequent sex, and I am trying to get pregnant.
My fiance wants kids, but I may be too old to have them. I love him/want to be with him, but I don't want to deny him a child. What should I do?
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