Your question has a number of different pieces to it; the age of the person being educated, the existence of a place of education, the potential relationships between the parties, and the here and now vs. speculative condition of anarchy.
What I am enjoying about answering this question is that my answer seems to stay the same regardless of which variables I plug into it. What a pleasant break from the constant caveat of it depends.....
I think that teaching to a developmental age will come naturally if the teaching is anarchistic. My idea of educating/learning as anarchists is that it is a dialogue in which both parties listen to each other (not just words but are able to connect enough to read lots of kinds of signals too) and so what and how something would be taught would vary wildly depending on who was “teaching” and who was “learning”. Part of this thing I am calling listening includes not forcing a topic or relationship if it isn't meeting the goals of both parties.
In terms of what anarchists would educate I assume it would be something that all parties involved understood why they were learning/teaching it and had a desire (not necessarily a pleasure desire, just a motivational desire) to be there.I think that “reason” behind education is a big difference from what the school system offers, which is “because you have to in order to move forward”, hence a society building/coercive reasoning. That said, I don't have a problem with motivational desire, meaning I want to do something because of the options it provides me as opposed to a joy I derive from the doing itself. I’m actually kind of into motivational desire, but that's a different topic...
So, how would an anarchist educate? A couple things come to mind. One is to use all of our senses and perceptions. Including in a “lesson” physical release, tactile perception, emotional response, intuition, judgement, muscle memory, association with taste or smell, etc. In doing this the educator asks the learner to take ownership over what they are learning and to make their own, to trust their own response to it, to allow the material to change based on how they understand it. Another part of this process is sharing experience, with the “educator” establishing their authority in the subject matter by personalizing the topic, what mistakes they have made, how they currently experience the topic, why they do it, etc....
Anarchists can also probably teach better if they aren't scared of what they know, and are assertive about it. While learning is a process and a dialogue, it is not helpful to either claim expertise you don't have or to act guilty about having a skill set. I’m all for people knowing about stuff and being responsible towards that knowledge and there being the parts of teacher and learner, cause we aren't all magically equally skilled in everything (good!).
And, also, the “educator” can ask questions they don't know the answers to. And make mistakes. And then the roles get mixed up and reversed and become less clear. Which is cool.