Ageism has existed for a very, very long time. It's not political, though, it's sociological and psychological. From a cognitive perspective, it's not dissimilar from racial or gender stereotyping. The difference is that it's much more socially accepted.
Younger people have less experience, everyone knows this, but experience does not necessarily mean one is right. That less experience means one is incorrect or less trustworthy is a fallacy which leads to a stereotype. I'm sure that car insurance companies or police can present verifiable studies about how younger people are in accidents more often, but that does not prove your personal guilt.
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