My guess would be it's written at a third grade level.
I could read it just fine in third grade but didn't understand the concepts. Yet, I could read the newspaper and understand it with no problem at all.
Newspapers in America are typically written at a sixth grade level, or so I've read.
Now, after attending college and getting an advanced degree, I see it's because of the illogical arguments presented and not the intellectual way WT and A! are written as to why I couldn't understand a WT article.
After reading an article recently, I couldn't believe how simplisticly and clearly illogically they are written.
They are obviously written at a very basic elementary school level.
How condescending to their readers!