This describes all non-technical users, not just "old people."

Yes, but even non-technical users have a different relationship that formed over the young (neural plasticity) days.

"I click the <next> button on this form, nothing happens. Given that I have an internalized notion of forms as a multistep flow, maybe it couldn't advance because something is missing on the current step? Maybe it will give me those messages below or above the form? Maybe some read message somewhere? I'll search for those and try again"

vs

"I click the <next> button on this form, nothing happens. Not sure what would happen next. Maybe the thing will tell me? I can't see no dialogs, no messages, no error screen. Nothing changed. Maybe if I press it again? Nothing? Hum, maybe is disconnected from the network? It's the wifi again? Maybe if I power cycle the wifi router it will reconnect? I click next again now I get a clear error message: no internet connection. I suppose my internet is broken again. Will call my tech-savvy friend."