Excuse me, I was talking about the actual test that we do for black belt and not the classes leading up to it.
There is a difference between classes, concepts, and material that we teach the students based on ages. We do try to keep them similar because most of our adult students are also parents of students so by keeping their curriculum similar it helps them to be able to practice at home together. We do cover things with adults that children don't get yet. Personally we have done a lot of hand to hand, hand to knife with an arnis master that we do not even think about covering with the children. This is great for adults but is not used at black belt testing.
For our black belt testing we do a physical portion which is a 2.5 mile run, push ups, sit ups, kicks, combinations, punches. We also do a written test which covers TKD history, questions, belt meanings, things like that. After that we do a 1 hour work out with all the instructors and testers which is then followed by the actual test. Then they will do sparring, black belt form, board break, and a self-defense of their choice.
That is what I was meaning when I say juniors/adults do the same test.