>Most of them don't know a thing about computers. It's a magic box with a small selection of shiny buttons on. They use it for passive media consumption.

You'd be surprised.

Except by "know about computers" you mean they known about interrupts, and cache lines, and filesystem design, and other stuff that are completely inconsequential to using their computers.

>Well, they clearly forget by the time they're twenty.

Actually the linked article states the opposite:

>"This current generation of young people has never lived without tech," said Linda Rosen, CEO of Change the Equation. "It's second nature to them." Yet, using technology for social reasons doesn't make a person adept at using it in other settings, she said.

So it's not that they "forgot" something, it's that they never bothered to learn it in the first place, e.g. Excel or whatever. But computers, for what they do like to use them for, are "second nature" to them according to TFA.