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I think it's absolutely fine to ask such things, because that's how you get to know the person. What you should should never do: NEVER try to change someone's opinion to something that you think is "the right way".
My wife and I have chosen not to have kids. When I hear “who’s going to take care of you when you’re old?” I think that they had kids for purely selfish reasons. Also you could be a jerk to your kids or vise versa and still not get what you want.
I can't comprehend that that's the first people think of.
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