I'm 51 and work in tech. I now understand the nuances in this article. I'll probably understand them better as time goes on. Young readers probably skimmed over the bits about floaters in the eyes. Everyone older than 50 gets it. Young readers probably skimmed over the bit about frequency definition, captions etc. Everyone older than 50 gets it. I don't get the bit with walking sticks yet, but I am not there yet. But…
There is also the 'no bullshit' attitude that starts to emerge when you turn 40. You want product to do a thing. Not to engage you in any way. You either already have a life or you know you will never have one.
Many older people have money and they are willing to spend it if does a thing and it's easy to get.
If Amazon would buy Paul Graham's old Viaweb code, it would need just little updating to become a tool that generates killer UI's for the aging population in the developing world. Plain html5 with commons sense and good defaults with tiniest amount of javascript is all you need for a well functioning web service. Incidentally Hacker News is not far from this ideal.
This is what good news site looks like: http://lite.cnn.com/en