I think that's a bit disingenuous. In the early 80s we had one computer in the school that was massive and moved around between each classroom so each class could take turns at some random educational game. They weren't used otherwise.
In secondary in the mid to late 80s we had a computer room but it was only really used by people doing "computer studies".
When I was at uni in the early 90s there was no internet in use and we used books and microfiche for research. We did have access to computers for basic word processing.
When I started work in the 90s, the computers then were very basic compared to what we have now. There was no windows at my first two jobs, for example, and email wasn't made available at my workplace to the rank and file until the late 90s/early noughties (and we were initially restricted to internal email only). By this time, those now 90 would have been nearly 70 and likely retired or nearing retirement.
It also depends what jobs you have done. My mum is in her 70s and in later life has not done a job where she has done a lot of computer work so isn't as au fair as someone that, for example, worked in an office. Similarly with DH's parents. His mum never worked so really struggled with technology. His dad is a little more confident but retired in the.early noughties so hasn't kept up with it.
It's also reinvent to mention that the progression in technology in our lifetime has been incredibly rapid. In the space of 30 years we've gone from no internet (obviously it was invented before then but it wasn't widely used) and most people not even having a computer at home, to smartphones and internet being used for everything. If you haven't been able to keep up with the change M, like any rapid change it's very easy to be left behind.
I'm in my 50s I've grown up with this technology, with the start of the rapid charges being when I was in my 20s and 30s and working. It was therefore easy for me to keep up with and I was at an age when I embraced it (or walked blindly into it depending on what we are talking about!!!!). Now being in my 50s I can see why if this was all just starting now I might not be able, or willing, or have the opportunity to keep up.