I have an only child at this point. He is 20 mos. As another poster mentioned, I am 40 now too and am very frightened to try. I would worry the whole time if everything would be okay. Plus, DH is even older than me...
Since DH and I are older, we originally thought if we had any children, we would only have one. Surprisingly, after I had DS, I actually thought, well, MAYBE I would have two. However, the urge is very small. We tried once a few months ago and right away I was so worried and thought 'what did we do'!!!! Well, I didn't get pregnant and I was pretty okay with that. I guess it won't happen for me, but I hate it feeling so final in a way. I just got done packing more of my son's outgrown clothes away. I haven't parted with hardly a thing of his. I just can't do it. Have others experienced this? Will I get over it!???
I do worry about him not having a sibling. Part of me thinks without a sibling, he will be that much closer to DH and I, but siblings are nice in alot of ways. I guess there are pro's and con's to everything.