I look like a school girl...

So, at church I was talking. And Sam-who-lives-with-Ian-Lim said that I looked like a school girl.

And then Joab said that I looked very young. I pointed out that Sam had already said that I looked like I school girl. Joab said, "I never would have said that; I have more tact."

Which is true. Which is why I didn't hit him.

Keith then said, "Upper secondary? Or a mature lower secondary?"

I did hit him.

So, what exactly was it that made me look like a school girl? I don't mind it precisely, but I'd like to be able to harness my school girl-super power at will rather than haphazedly.