We all know the type of people OP is referring to. Pretending they do not exist does not really make anyone's life easier, especially when the discussion at hand is literally about trying to make their life easier by reducing the possibility of a mistake.
The people OP is talking about are ones who are not computer literate. Those people can be of any age. There's just no reason at all to related it to age.
Or perhaps an overbroad generalization? If you work in adult day health dealing with backblaze personal backup IS in fact beyond the abilities or interest of many of the folks there.
Or do you not have personal experience working with the very elderly? The very elderly engineers are more into electronics (physical) and can run rings around younger folks on older electronics (repair / vacuum tube testing etc). But I've not seen high levels of interest in things like Backblaze personal backup API's.
Very old folks can start to lose decision making capabilites. It has nothing to do with IT knowledge. It's why mostly old people fall victim to email and phone scams and refuse to believe the truth even after you show them mountains of evidence.