I've noticed older people tend to be more brainwashed.
I tell my old hippie friends that the U.S. runs Al Qaeda. They say that's crazy, because they consume only mainstream propaganda like NPR, MSNBC, PBS, etc.
My young friends who don't own a television say: "Meh. Figures.".
Older people are less likely to gather information from Social media sites such as Twitter and Blogs. They tend to depend more on the mainstream TV channels, such as Faux News. So, it is not surprising at all.