My DS is a little younger, 6 y/o with dyslexia and dysgraphia and dyspraxia. The dysgraphia was easy for me to explain to him: that his brain worked so fast and quickly that his hands have difficulty keeping up with his thoughts. Dyslexia is a term I use frequently when discussing with others about DS (while he's around). I tried to explain it as just a difference in a way of learning things, that some people's brains just work differently and learn differently. DS is not stealth, more "typical" with reversals/etc, so I explain that his brain has an ability to work in this way (see things conceptually, great imagination, etc). I also explained how a group of kittens and a group of lion cubs need to learn different things to be successful cats/lions, and we wouldn't teach a kitten how to hunt a gazelle, nor a lion cub to do cat things. They're similar but very different.
Sorry no experience with stealth dyslexia though I'm sure I would go all out on the stealth aspect and talk about ninjas, spies, etc.
