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You can search for J. Rogan with Robert Sapolsky podcast where doc said that either prefrontal or orbitofrontal cortex finishes developing at ~25 years old, so brain can learn about environment and extrapolate accumulated experience later throughout life. I think age bias is not appropriate, because youngsters could consume propaganda with memes, feeds and games as well, just through the different medium. What matters here is anxiety level and/or IQ.

Admittedly, there is definitely a precedent for youngsters who fall for fake news. I am reminded that a number of under-65s thought they could charge their iPhone in a household microwave, even though you would think that common sense would dictate otherwise.

https://www.dailymail.co.uk/news/article-2768976/Emergency-s...

Anxiety can also increase for older adults

https://www.livescience.com/8452-anxiety-increase-age.html

(I can't find the original papers)

Woah, very interesting study, thanks for sharing.