Total nonsense. It's just used to retrocon why teenagers are given less and less responsibility.
For virtually all of recorded history by 20-21 you were an adult with approximately 3 kids. If people had no common sense by that age they would be dead.
The brain responds to input - if you are given no responsibility, then your brain never learns responsibility. People keep "chasing" the magical age when you are responsible, when actually you have to learn it. And you have to learn it by doing it.
You can't wait until after you have it - it doesn't work that way.
Car insurance goes down after 22 because by then most people have had 6-8 years of driving experience. If you started drivers earlier, then insurance rates would go down earlier as well.
> For virtually all of recorded history by 20-21 you were an adult. If people had no common sense by that age they would be dead.
There is a pretty gigantic difference between "isn't fully developed" and "doesn't exist at all". Try not completely rewriting the position you are responding to just so you have something laughably easy to rebut.
This is particularly silly in a medium where the original you are responding to is readily available, and even more silly when you quote the bit you are radically rewriting in your own response.
