And you're not old compared to a lot of others here. I'm almost 47 and pregnant with number 2. I had all of the thoughts you wrote about, too, but, in our case, we live thousands of miles from any relatives and I wanted DD to have someone else when we're gone.
Mind you, I hope we're here to dance together at her 40th with her loving husband and kids. (That covers everything, doesn't it?)
Please do not think I'm insinuating that your post is in any way inappopriate. It's not. You titled it well and put headings to let people know what it was about, so no one would be caught unawares. But you might get more responses on the PG after DE board above because that's where the women who already have chldren usually post.