My biological clock is ticking so loudly that often it drowns things out. I have to shake myself and remember that Now Is Not The Time. We want to do things in the right order--finish our educations, get married, and buy a home before we have children.
Personally, I cope with it by working in the field that I do. It's a constant reminder to me that having children isn't all peaches and cream. Raising children involves a lot of poop, money, pee, puke, tears, and difficulty--oh, and health insurance. I can't wait to be a mom, but then again, I can. I know it will happen someday, when the moment is right. That isn't right now.
I think you're also feeling a bit of separation from your nephews and nieces, GG. Does the church you attend need a volunteer in the children's ministries? I know around mine, we can always use an extra pair of hands. Get into something involving kids--it will help.
I guess I'm lucky in that I've nannied for a lot of moms with Ph.Ds and subsequent academic careers, and working for them made me realize that I COULD wait to have children. Some of them waited quite a while--one mom I work for is 42, with a 14-month old.
Around here, older moms are the norm. It's a good reminder that having children sooner rather than later is not always the best route.