I'm 40 +2weeks, no ,not 2 weeks overdue! I've a LO 11 months. I've surprised myself with wanting no2, my hubby too. One of my main reasons is that I think it'd be a right bummer for my LO to grow up with older parents and not have a bit of younger company around, thinking too of him having to deal with us when we're really old and he'll have no support from brothers or sisters.
Also, I never realised how much I'd enjoying having a child. My DH and I have been together 19 yrs, it's been a real big change for us both but one that we're really loving. If I could turn back time, would I have done it sooner... maybe by a year, but that's now because of the desire for no2. I'm now of the frame of mind, sure, i'd love another but I'm not going to hang it out too long, if it happens it happens, if not well then I'll just thank my lucky stars I was able to experience the joys of parenting once.