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Misinformation causes serious harm, from sowing doubt in modern medicine to inciting violence. Older adults are especially susceptible - they shared the most fake news during the 2016 US election. The most intuitive explanation for this pattern blames cognitive deficits. While older adults forget where they learned information, fluency remains intact and decades of accumulated knowledge helps them evaluate claims. Thus, cognitive declines cannot fully explain older adults' engagement with fake news. Late adulthood also involves social changes, including general trust, difficulty detecting lies, and less emphasis on accuracy when communicating. In addition, older adults are relative newcomers to social media, who may struggle to spot sponsored content or manipulated images. In a post-truth world, interventions should consider older adults' shifting social goals and gaps in their digital literacy.
Brashier et al. (2020) studied this question.