It happens to all homeowners. It can be sad, scary, exciting...
At some point, one of your current neighbors will move. CHANGE has just entered not only the seller's life but yours as well.
Sometimes you are so excited you can't wait. You figure, it can't be any worse. There is only room for improvement. Surely the new owners will mow more often, plant a flower or two, pay attention to the garbage day, etc.
Sometimes you are filled with sorrow and loss. You are losing a friend, a great babysitter, a dependable good neighbor that always had your back, etc.
So are you going to peek through your window and watch the new folks arrive? Count how many there are? See if you can guess their ages?
Ah, come on, you're better than that! Bake that pan of brownies, write down the garbage and recycling days on an index card, and maybe even the school bus schedule if it looks like it may apply, and go meet your new neighbor.
Life is full of change. May the best outcome be that you have a great new place to visit your old neighbor and your new neighbor cooks the best chili you've ever eaten!