I used to get pressure from co-workers at my old job. The ones who wanted to "spread the love," when I could hear them on the phone every ten minutes trying to manage some kid crisis from their little fleshies who were as little as 5 all the way up to adulthood. One thing they used to tell me was "who's going to take care of you when you're old?" My reply, "same person who's going to take care of you. No one." lol People always assume their children are going to take care of them when they get old, but I work in a nursing home, and see people dropping their parents off every day. The last statistic I saw was that about 1% of people end up in nursing homes, but I'm pretty sure that's on the rise. It doesn't matter if someone has 1 kid, or 10 kids. "Thanks for a great childhood, car, college, and putting a roof over my heard all those years dad. I'm sorry you have to stay here, but I just can't manage my life and yours. I'll come see you every week, I promise." Right.
My new co-workers don't bother me at all about it, which is nice. People out-and-about seem to feel free to grill others on why they chose not to have kids, but if someone tried to do the same to them, as in "why the hell did you have children?," oooooooooh, I bet that wouldn't go over so well, lol.