Eastern Europe in general can be like that. You can have grandmas living next door to rich families.
That is slowly changing, however, as the rich move to secluded spots in the countryside, middle class moves to the suburbs and the super poor move to the dachas. The flats in the cities are still getting more expensive somehow.
I once was hiking in the Tatras and upon reaching a part that was more difficult, heaved a sigh and said “Pizdec”. Everybody laughed, even people from further away.
That’s only if you assume male-to-female ratio of 1:1 if they had, say, 10 women for each man, they would only lose 10% of their population per generation. However, if roughly one in ten pregnancies were with twins, the population would be stable.