Hehe! One can never have too much goodness.
I wouldn't worry about the two sets over 80 and what it will bring... if I am guessing right, it will be two more sets of people that have not squandered their money and are willing to go the extra mile to make their place a home. They don't normally get there being selfish, arrogant people... I think your timing for buying was impeccable.
I am hoping that when the others do move on, the neighbors will be similar to us - easy going and friendly with the neighbors. It is nice to chat with everyone and have the odd drink together without planning.
That is exactly why I love my neighborhood. Ours is mostly 40's and up, but, still, lots of young kids as in the Washington, DC people tend to have kids later.
Anyway, thank you for the words and... very much.