In days gone by most people grew up, worked and retired in the same area so they knew, or knew of, almost everyone in their community. They also tended to know everyone’s business. This had its downsides but it also meant that, even without family, nobody’s problems went unnoticed for long - and the sense of community usually meant that an offer of help soon followed.
That may be a slightly rose tinted view, but it’s certainly not like that any more. These days your nearest neighbour may only have moved to the area recently. Perhaps you've only lived here a short while too. You don’t know each other and how would you? Getting to know your local community used to take a whole childhood and longer. These days we don’t bump into each other like we used to and it means that we just don't know when someone nearby needs help.