At my "home" school, the kids learn the same things as the adults only at a slower rate- they are given stripes when they get half of the material for a belt rank- there are no stripes given in the adult classes. They can get a Jr. Black belt, but must wait until they are 16 or older to try for a regular black belt.
In another school I was associated with recently, they had an adult system and a kids' system. The kids progressed up to Jr. Black Belt, but for each test, they only had to know the material for that test, nothing was asked (technique-wise) from the previous ranks. Once they reached Jr. Black Belt, they received a black belt with a white stripe running thru it. They then started over at yellow and went thru the sytem again, each level having that rank's color running thru their black belt.........and this time, they did have to retain all the material from previous tests plus the material for their current testing rank. I don't know if there was an age limit for getting a regular black belt or not.
:asian: :karate: