we are also asked the same question, but since we are older , they assume we already have our kids somewhere. When I tell them we have no kids…..they start shaking their heads in sympathy or some even have pitying looks. Some start giving advises on adoption or surrogacy. My husband and me have no problems not having kids and this has got to the point that it is not funny anymore. So just to stop all this we give nosy strangers answers like “oh my son is working in the US”…and each time we get more inventive with the answer. It may be a fib,but it saves us from all the sympathetic nodding and advises.