In my experience, only people above 30 watch reality shows. Virtually all reality shows are for old people. Real Housewives, everything on HGTV, everything on the History and Discovery channel... the only network that's associated with youth that has reality shows I can think of is MTV, but even that is probably more watched by aging men trying desperately to relive their cool days.
I question the veracity of that statement. Whenever you see a mob of screaming fans surrounding one of the Kardashians they tend to span all age groups. And twentysomethings are always trying to get me to watch the latest E! reality show.
Sarcasm aside, the relative popularities of Fox News on TV and Vice on the Internet are pretty good examples of what this article is talking about.