60 year olds have been using computers most of their working life. Word processors and spreadsheets having been ubiquitous for office workers from at least the early 90s.

Most people under 60 aren’t full stack devs either.

Well, neither am I - I am talking about my own peer group, non-tech types just fine with computers.

I'm 55 and likely have been using computers longer than that poster has been alive. Regardless of the fact that I started young, by the time I was in college the PC revolution was in full swing and everyone had and worked with computers.

My mother, born in 1934, had no problem using computers. She didn't internalize how they work, but she learned the workflows she needed. How to launch applications and so on.

The situation described in that comment is just a broken app, it has nothing to do with the age or the understanding of the user.