I think the age thing is about habits. A lot of older people grew up preferring reading stuff on paper to reading it on some flickering CRT display, and that habit is still with some of them. Younger people never got into the habit of printing anything.
Flickering CRTs were a bad habit. But needn't be so. They were just cheap, or bad quality, or powered by a bad graphics card, wrong setup. One could always use good ones instead.
