I'm thinking of using this picture in a roleplay but I suck at recognizing ages. How old would you say she looks?
I'd say about 10, but you could push it as high as 12 without resorting to "lol anime ages" logic. She's clearly prepubescent, so I have no idea what the people saying anything 13 or older are thinking.
I'm basing it off of my personal experience with girls between the ages of twelve and fourteen, which is, admittedly, significant. She looks close to or a bit older than my [undisclosed contact]'s friends, so I estimate around fifteen. Thirteen's pretty good too, though. Ten is really pushing it in the animé-flexibility direction.
I think the way she's dressed/the way she's sitting is skewing people's estimates of her age up. We're used to people of certain ages being depicted certain ways. Just looking at her face, I'd say she's a tween - 11-13 maybe.
Twelve to fourteen. It's hard to tell with anime so opinions would vary, but if I look at her I get the just barely a teenager vibes. That or she's a late bloomer if you're trying to push for older.