I'm 48 and our youngest is going to graduate high school next year. My aunt and uncle had their last kid when he was 55. I couldn't imagine a new baby at my age and 55 would be insane.
My FIL has a fried that did the same thing. Had a couple kids, then something happened & the doctor said “you’re sterile, don’t waste your time on a vasectomy.” He didn’t think about it again for 18 years. As the youngest was going to college his body fixed itself & they got another at 55.
I told my doc to "double knot" it when I got cut.
The thing that scares me is I met a fertility doc a long time ago at a bar in San Diego. We were bullshitting and he told me a story about how they needed a "sample" to test out some new equipment at his office. He provided the sample and there were swimmers after being cut for quite a while. Evidently there are rare cases where nature finds a way and that crap grows back together.