I've visited nursing homes and talked to many lonely old souls - whose children never come to visit them. Having kids is not necessarily old-age security.
We have been married less than a year and I can definitely feel the social pressure to have children. However we can't help it that we didn't even meet until we were nearly 40. Children may not be in our future and we're willing to accept that and will be happy use our time and money to help others instead. I don't even mind holding the fort when one of my co-workers has to run out on a family emergency. They are all excellent fathers and I'm delighted that they love and cherish their little ones like they do.
I have a hard time believing I'm going to get to heaven and be confronted by an angry mob of my unused eggs. Especially since God hooked me up in middle age with the most wonderful Christian man I could ever imagine, long after I had given up on ever being married (he had given up too for that matter!).
I have been married for 4.5 years. About a year ago family and friends starting pushing the "have kids now" agenda. Well, to shut them up and have a little fun, my wife and I have taken to coming up with the worst possible names for a baby and when they bring the topic up we tell them we have to come up with a name first so we are not unprepared when it happens and then unload some names on them. Shuts them up every time. Below is a link to a thread I started on the matter. Try our method and see how it works for you. Trust me, it is a lot of fun.
My mom cringes and gets really upset when my wife tells her that if we have a girl her name is going to be Drucilla!