This is very deep, and I think you are absolutely right! In my experience a big blockage for many people seems to be that they think because they are grown up, they have stopped learning. While age does bring wisdom, I think it’s important to never stop learning and growing- and to always nurture an open mind! 
I’m glad that cartoons are introducing new concepts and keeping things accessible for all ages to enjoy! 
I hope Avatar hooks you in soon! 
One of the best things about it is falling in love with the characters and watching them grow and learn over the course of the series. Enjoy! 