Prejudice based upon age is the last remaining socially acceptable form of prejudice. Most articles about adolescents read exactly like opinions about various races, women, etc in the past. The arguments are the same, and the conclusions are the same. The lack of scientific evidence is, also, the same. Repeatedly they observe some limitation and conclude, without any evidence at all, that the limitation is not due to lack of education or socially-inflicted lack of experience but endemic and unavoidable.

One of the most popular misunderstandings of neuroscience going around recently is the "brain isn't fully developed until age 25" idea. This is often parroted and repeated, often by otherwise quite knowledgeable people, without any understanding of what brain development is, or how it occurs. The idea is used to support notions of restriction and sheltering, which is totally at odds with every understanding of how brain development actually occurs. The brain develops in response to novel experience, and solely in response to novel experience. Lack of novel experiences leads to lack of brain development. When an infants visual cortex is immature and incapable of stereoscopic vision, the exactly wrong course of action would be to cover one eye. Doing so would prevent the brain from developing the ability to integrate vision from both eyes into a coherent single image. The issue is even more problematic when you look at what criteria is used to judge the brains "immaturity" in the material supporting the "immature until 25" claim. What they examine is neuroplasticity. They observe that neuroplasticity reduces substantially after age 25. They interpret that as a sign that the brain is 'done' with it's primary development, but that's a bit of an arguable point. It is just as likely, in my opinion, that neuroplasticity in a high state is the desirable condition and that its reduction is a consequence of the end of introduction of large quantities of new experiences due to most people entering the working world and settling into a 'routine' life.

On a lighter note, just imagine if this perspective were to change, socially. If in 10 or 20 years time prejudice against teens were viewed with as much disgust as racism and sexism are now. Old tweets griping about teens being surfaced and people being 'cancelled' over them, etc. It would be quite different. But, there would probably be markedly less school shootings.