I think there are quite a few women in the Dec ddc who are around or over 40 - maybe they just haven't seen the thread yet.
I turn 40 the month after baby is due. I have a new partner, my husband and I separated about two years ago, and my dp and I have been together about a year and a half. It was a pretty sure thing almost from the beginning - unexpected, but wonderful - and we stopped "being careful" after about six months together. For kind of the same reasons - I knew that if I was going to have one more baby, that I wanted to do it as soon as possible! for age related reasons. I was also surprised that it took a whole year to get pregnant! Especially considering three of my four other children were pleasant surprises! I wasn't even expecting to get pregnant at that point, it took so long. But, that made it even more exciting when I finally saw the positive.
So far this pregnancy has been very similar to my past pregnancies. I don't really get morning sickness or too tired either, and that's the same. My kids are actually all over the age of five with this pregnancy, so it's probably even less tiring than in the past. I always show early - that's the same. I think maybe my boobs have gotten more sore and bigger a lot faster this time, but that could also be because I'm carrying about an extra 10 lbs to start with. And I'm way gassier/bloated feeling than I remember feeling with the past pregnancies. But I don't know that that has anything to do with age - I have a feeling as the pregnancy progresses I'm more likely to start to notice any possible age related differences. Also of interest - a nurse friend of mine reminded me that with a different father there is different dna involved, which can also create a different sort of pregnancy... food for thought.