Well, I am still learning how to teach... anybody, anything...LOL. But, I do have one 6 year old right now whom I am teaching quite more in-depth than probably any youngie before her, and possibly more in-depth than any other of my students (ever). The last part of that statement has a lot to do with her as an individual, also.
I have a list of things (skills, informations, understandings) I would like for my students to walk away from my studio with, whenever they have learned sufficiently what I can help them learn of those things off of that list. At this point, nobody gets anything more than anyone else really, no matter what age, though, their curriculum is entirely idividual and depends greatly on who they are already. Proportions of each thing will vary at certain times and between individuals.
In short, I help her with the whole enchilada. And really, that's what I think piano lessons ARE. How I do that, is another matter.
m1469