My mother was 43 when she had me. She had a potentially terminal heart problem from when i was 14. 7 heart attacks and a stroke followed until she had a double pace-maker fitted when i was 17. Within 3 months of having the pacemaker fitted she was dx with stage 4 cancer and given 6-12months to live. She decided she wanted to see me finish university and lived another 6 years, and died when i was 24.
Despite all of that i am SO SO glad she had me. She was a fantastically interesting woman and gave me many gifts in our relatively short time together. My XP's father had him when he was 24 and died of bone cancer when he was 37, and XP was just 13. Life is like that, you can't see ahead, there's no crystal ball.
So i say if there is love in your relationship and in your hearts then go for it. Even though i wish my mother wasn't ill and hadn't died when i was young, given the choice i would so rather have what i had than nothing at all.
We talked about it tonight and I expressed my concerns and he feels kind of like most of the rest of you... it's not that big a deal. He is healthy and takes good care of himself. And no one is guaranteed tomorrow. So we decided to go with it till he's 50... that gives me another 7 1/2 years we'll see what happens!