Existing as an ego for more years does not mean you're smarter.

It is, however, their only lifetime accomplishment.

As for the rest, well... we have the effect studies of that form of abuse. Especially...

at the same time, professing to be innately qualified to speak for, think for, choose for, pass judgement, and stereotype those younger than you.

...this. Here. Have one example...

https://www.ncbi.nlm.nih.gov/pubmed/15601964

Here. Have another...

https://www.ncbi.nlm.nih.gov/pubmed/21804682

...and so on. We know the effects of this sort of abuse. On the other hand, there's not much one can do, because Childrens' Services under various names mostly exists to promote and demand child abuse, seizing children from nonabusive parents, and/or serve as an Evangelical rape-to-order scheme.

Yay!

Being more intelligent than 99% of the population can be incredibly fucking aggravating sometimes.

Yeah, well... wake me when it starts sinking in how literally evil an astounding number of people are. It's not like people don't know that there isn't some connection between "child rape" and "heterosexual parent," it's not like people don't know that runaway youth are forcibly trafficked to places they left... they're either deeply enjoying bullying people enough that rape is okay, or they like rape so much that bullying random innocents is okay.

Yeah, that's the human character of literally everyone around you. They can't claim they don't know.

On the bright side...

"we can't give children equal consideration - can't you see that humanity would somehow immediately devolve into chaos?"

...you can mock the shit out of these people with the available data, which is very, very ample. You might want to skip the humblebragging about being more intelligent than several of these people (not a large accomplishment, by the way) until you actually look up the available data on a subject of interest to you. We know what it does, we know what the effects are. We can make fun of these people for hours on end. Or, for that matter, we can know exactly what the effects will be. Physiological, sociological, et cetera. We know exactly where that ride is going and can act accordingly.

They do this largely because their only accomplishment in life is "failed to dead," and they fuck up other people's lives to distract themselves from the fact that they can't manage their own. No big deal, except for the swath of destruction. And this latter half completely determines who is "in charge" in a society.

Great. We know where the ship is going. What are you going to do with that information?