Many years ago Little Tikes toy company wrote the assembly instruction on a 12th grade reading level. They had to revise their thinking because 70% of the US population had a 10th grade reading level.
I'm reading kids books from the early 1900's . Kipling in particular. They are filled with words I've never used. there again i never got through to post secondary education. I would recommend Kim and Stalky and co. Brilliant stories.
Makes sense:
I do a ton of exporting to the EU and we have all these guidelines to follow on making products that can be used by the illiterate.
The elderly tend to be more educated. The US education was mush better 40-50 years ago
I live in a very rural community and I believe it, if I take people in this community as an example. My wife is in charge of the library and people in general take out movies and use the internet but most don't check out books. Most of the good teachers have deserted the schools also.