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Could this be because older people have more memories of when certain things were better than they are now?
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The issue is that "better" is subjective and the subjects are shaped by the environment they grow up in.

Most people thus naturally prefer the world as it was during their formative years.

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Sure and the reason why is they were kids and their parents handled everything.

They don't remember when things were better: they don't remember that they were children.

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Without saying too much, I think this is more common in young people than you may think.
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Your comment lays bare the problem with Gerontocracy
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