The median age of working adults is probably around 40 or so, including those who's job it is to evaluate literature for use in schools. So it makes sense that you'd appreciate their choices more when you turn 40 or so.
This is an interesting situation, because it creates a reading list that is a "projected aspiration". We hope, I guess, that kids will read precociously. Education is, after all, the teaching of civilization's most important messages compressed into a fixed, very short time-span. School gets kids "caught up" on the civilizational conversations about things. But so much of the art and literature of humanity is like Lolita, in that it requires lots of actual living to appreciate (unlike algebra), so its position is...odd.
I wonder if, by being exposed to these things at a young age, we give kids a "shared coordinate system" to interpret and express their world, and so shape their choices in it.