I know of plenty cases where elders take over a phone and have no need for the latest iCloud stuff or other features. They want a fast iPhone 6 that has the os installed it came with in the first place.
That’s not even justifiable in any case. Being an elder does not exclude you from the progression of technology. Apple did not force anyone to update their phones. Sure, the little number one button in settings is a small annoyance, but you didn’t have to click install. If anything app makers taking advantage of newer API’s and features are the number one reason to upgrade.