Back about 100 years ago in this country it was very common to have elderly relatives living with you. Children grew up knowing their grandparents, having their life experiences to learn from and the grandparents enjoyed daily social interactions with their family.
In many other countries this is still the case. I love hearing about places that integrate schools and nursing facilities. I have personally seen the listless eyes of seniors spark to life when a child interacts with them. The children meet more loving adults (a child cannot have too many of those in their lives).
Here’s the website of a documentary film in development about this type of a program. I love watching this!