I'm 30 now, will be 31 when this little one arrives. Dh has always said that he wanted to be done by 35 (he will turn that right after 'spots' arrival) because he has this fear of being an old (read:boring) parent during the teen years. Now, his parents were older than mine, and not at all boring, heck, they are still more fun than we are half the time, so no idea where this comes from, but works out good, since I was planning on another year first, so this fits his 'plan' better
But wow, the idea that I'll be nearly 50 before the nest is quiet, hadn't really added that part up yet!