Would you notice if your neighbour died?

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It sounds maybe a little morbid. But it is a serious question. I have another discussion about the event when a single mother has died and her 7-year-old daughter did not say it to anybody only after 5-7 days. Another event, when the neighbours found the dead man after 1 year. In Austria a woman locked her three daughters into the dark house (without light,and electricity) for 7 years. The girls come out a few weeks ago. (they do not speak german, they have special own language) I heard that an old lady died, and her son did not speak about it to anybody for years, because he needed her monthly retirement pension. It happened in Hungary too. I am sure, that if one of my neighbours died I would not notice it. Because I do not know them at all. On this floor there are 6 flats. And there are 10 floors. I would only notice the strange silent in the flat under mine, because they are very noisey. Would you notice if your neighbour died, for exampe?