Irrelevant? I was directly responding to misinformation you stated:
First you start off by saying something that reflects either your lack of knowledge of how much time has passed, or your misunderstanding of Thrall's age. Turns out it was both.
Then you conclude by calling OP a lolicon because he doesn't want her to look like a kid.
There's no indication you're talking about the real life passage of time. Even if you were, it would have been stupid for you to be because the OP wasn't. Also, even if you were, Thrall still wouldn't have gray hair.
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She's either the same age as Anduin or up to 2 years younger. Anduin was said to be 12 during LK. Li-Li was said to be 10-12 in Pearl of Pandaria, which was set during LK. That would make her 13-15 in MoP, and should be 15-17 in Legion.