There are.
   But adults are selfish with money and prestige and hog it up for
   themselves and denigrate kids and teens. It's not a cognitive
   barrier; it's a language barrier and elitism. Comprehension and
   production of philosophical wisdom (its conceptualization) can
   be understood/produced via analogy.

   If you don't think kids capable of complicated thought, just
   talk to any kid who is into Pokemon and can weight out abilities
   against each and speculate proper combinations. Logic is a game
   like Pokemon. Know the rules, anybody can play. Even if you
   don't know the rules, you can still be correct.