My mom taught in a one-room school, though it only covered grades 6 through 12. At those ages, she said, it was pretty easy to get the (not always older) better able to help the ones who needed it. The most fun, she said, was that a couple of the seniors were older than she (she was something of a prodigy). I don’t know if that was the crucible that shaped her ability with kids, or if she was a prodigy also in that way, but by the time I was old enough to understand, it was very clear that she had an incredible talent with kids. (She and my dad (partly) raised 12 kids (1 natural-born, 8 adopted or fostered and 3 foreign exchange students). All the ones still living still get along well with each other! (That includes two of the FX students who were there only after some of us had already gone away to university).