I've become skeptical of everyone's narrative, if anything, but why would a person realize the official narrative is usually a lie, and then go on to trust someone else or some other group blindly? My guess would be binary thinking (it's always gotta be liberals vs conservatives for every argument), the misapplication of the law of the excluded middle (maybe there's a multitude of answers on a scale of correctness, not just two: right and wrong), and other fallacies and things like that.

The article actually doesn't answer the question, it's just a mix of random words and ideas about why it could be that older people share more misinformation with some incredulity towards 'ageism'.