I've known women who just don't have kids, by choice or by circumstances and probably never will.
My mom used to say of me, even when I was a young child, grade school age, that I was like a mother hen, watching out for my friends. Looking back she carried the weight of the world on her shoulders because noone was certain I could after my bike accident and surgery at 6. Because of knowing I had natural instincts most of my life, certainly not a perfect mom is why I knew I wanted children . Seriously, if it wasn't in you this whole time, why take the pressure to accommodate societal expectations. I'm 40 now, can't imagine adding to my brood nor adding to returning back to diapers and car seats. Car seats technically ended in January after 12 straight years. It will test your everything, all your triggers, any guilt, worry, if you react to loud noises. Yes, I wouldn't change becoming a mom. I certainly wouldn't pressure anyone into being a mom. Plus, can affect career. Even if you use daycare, they are strict about fevers, of course...24 hour rule. Surprise calls from nurses, broken limbs, bloody noses, the extra out of school activities. If home with an infant prepare for boredom. If your husband is 50, kiss retirement at 67 goodbye...it's a huge decision.

Have your husband really look at what's pushing this inside him. 50+ year old men, start looking at their future, their legacy, on and on.