I think people are misinterpreting the OP's petard:
It is not "Oh noez, old people!"
It is, "At the rate of technological revolution, and the increased technological training needed to adequately and meaningfully engage in the modern world, older people are going to become a growing population that gets more and more on the wrong side of the digital divide."
Which, again, I point cheekily at the 'extrapolation' cartoon. That kind of thinking relies extensively on accepting those extrapolated curves as "TOTALLY WHAT WILL HAPPEN OMG WTF BBQ!"
Again, if that kind of curve were to indeed come to be the status quo, industry would be unable to train people-- the costs of training would never have an actuarial timeframe where they benefit the company. Workers would be obsolete, in terms of their skillset and knowledgebase, before they even leave highschool.
Since that is a functional singularity in terms of how young you can demand your workforce be, natural chilling effects will rear their head against such curves, and they will **NOT** follow that kind of LOG scale.
Additionally, the notion of the premise-- that people must be fully educated in the technology to meaningfully interact with it-- has been patently untrue since at least the 90s. I would know, I have been a tech-head that entire time, and most people I meet do not come anywhere near the "information technology expert" bar, but still meaningfully use technology daily.
So, again--- Beware extrapolation like this-- and, further-- Conclusion does not follow from premise.