D&D should not be written for old people who've been playing D&D forever.
What does age or amount of play experience have to do with intelligent writing?
I would be put off by the 4E writing style even if I had been in 6th grade when reading it. D&D should be written for literate, intelligent people of any age who may be interested.

D&D should not be written for old people who've been playing D&D forever.
Plus ten billion.We 30- somethings are the ones with all the money. We're either buying it for ourselves or buying it for our kids. It had better well cater to us!
When I was 10 or so, my parents bought me my first RPG. The game contributed - in a small way - to my education. It helped sharpen my vocabulary and my math skills, amongst other things. The world of literature it led me into exercised my mind, and was part of the reason I grew up with above average literary skills.
The game didn't dumb itself down for me. It challenged me. And that challenge is what made it attractive.
I owe Gygax & Co. a good deal.
And that very challenging nature is WHY my parents bought me a weird uncool game. The role of these games was beyond that of mere entertainment.
(I also suspect that most people couldn't recognize "12th grade writing" or "8th grade writing" or "6th grade writing" if they saw it.)

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.