Or, you know, the childless old people can talk to each other and provide emotional companionship in an "old" way, from the previous age before all these modern economic inventions.
So yea, old people cannot be forced to hang out with each other just because they are old.
I can only think you are either trolling or have had a significantly different life to myself.
Plenty of things allow people (without children) to relate: sports, travel, religion, food, literature, movies, the weather, politics, technological events (man on moon), cultural events (election of the first Black president of America), pets etc. etc.
Old people don't need to be forced. 100s of millions of old people who enjoy each other company every single day.