I think the reason neighbors don't know each other is that homes are no longer made with a front porch.  At some point we all decided to stop sitting on the front porch and greeting neighbors as they walked or drove by and migrated to the back yard behind fences and walls.

I'm not sure this was intentional on our part yet it still happened.  And not just in one location but throughout the entire country.  Within 10 years, my research says, the entire nation was a back yard people.  Even more mysterious is the fact that we remained that way and still do.  Yes I know the pool and/or BBQ is in the rear yard so that's were the living takes place.  Maybe we just really don't want to know our neighbors or maybe they don't like us.  Who know's?

I think the reason my marriage has lasted almost half a century is the fact that we make time, usually on the front porch, to sit each day and just talk.  It doesn't matter what the subject merely the conversation is enough for both of us.  It can be about the neighbor's, music, cars, kids, etc. Absolutely any subject is on the table for discussion.  And yes I think this is a big reason so many marriages and/or relationships fail.  They forget to talk.  Discussion leads to communication and communication is what's needed for any relationship to grow and last.

For some reason, though we learn to communicate at a very early age, we forget to communicate when it's most important.  We come home and as soon as we enter the home we forget about communication.  It's not just a male thing.  I find, more and more, females are doing the same thing.  "How was your day" is not just an idle question it's an invitation to start a conversation which may or may not be totally about your day.  So take advantage of the opening and make use of the time.

It's never to late to start the communication or the front porch (or front yard with chairs) activity and get to know your neighbors.  If it doesn't work move.