Yes, so have I. And many more who feel compelled, simply by my existence, to explain why they don't have more children than they do. To the ones who talk about health issues, I respond, "I'm very fortunate to have good health," and to the ones who mention money I say, "People choose different priorities."
Those are good responses. I want to console them that one day they will have grandchildren, but that seems to be insulting to some people also! So I usually just say something like I am really happy to have a large family.