My seven-year-old niece is practicing being a teacher. Many of us did this to some extent. I'm pretty sure I forced my sister and brother to sit still while I read spelling words to them that they didn't care about.
Later, when I really was a teacher, I would see fifth-grade students come into my third-grade classroom and help kids in that same way, the "I really feel special acting like a teacher," way.
It's really fun to see kids do that. It's very special to see that the relationship is so important that they imitate it and aspire to it.
My niece, S, is very committed to her teacher role, not even slowed down by the fact that she doesn't have any siblings. She has been a teacher for her stuffed monkey, my parents' dog, and lately, a collection of stuffed squashes she was given.
It's really fun to see how excited she gets about playing school. She writes out schedules that are better than any school I've ever seen: "Hello, Drawing, Snack, Recess, French, Art." She writes poems for her students that are more creative than any I ever wrote for mine. 
She writes encouraging notes to the parents of her student (my parents' Golden Retriever):
"Your dahter is a bad student.
A. She is stinkey.
B. She dosen't do any work.
P.S. She needs a bath.
P.S. I'll help."
And she's very patient with her youngest students, baby stuffed squashes. She even told her mom that they can't really read, you know, because they're just babies!
I wish I could be excited about S wanting to be a teacher. Clearly, she has years to change her mind, but I would love to foster this love and get her really excited about being a teacher. How do I tell her one day that being a teacher is amazing and rewarding, but she'd better marry well because she won't be able to afford to live? How do I tell her that she'll have so many ideas for how to inspire her students, only to have to spend weeks giving them standardized tests?
For now, I'll try to enjoy it. She really is very gifted. And she loves Halloween! She's be a wonderful teacher.
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