The flip side of this is the pleasant surprise of working with a near-retirement age grandma who assures you that she "isn't technical" and "doesn't know how to use a computer", but will studiously write down every keyboard shortcut on little post-it notes and add it to their collection like they're porcelain cats she found at the Sunday markets. I've watched some of these people operate a computer in a manner reminiscent of watching an F1 driver at work, the screen just a blur as their fingers dance over the keyboard.

Absolutely, the ones that are clearly trying more than make up for the rest imo, and some are stunning. There are a lot of them. And many of the rest are just having a bad brain day and need help rubber-ducking to see the thing right in front of them - we've all been there, many times.

This sounds like "Smart person who has little technical experience and might have cognitive decline from age". The world is fully of people who's intelligence is legitimately lower than you might expect.