If you means ears as a layer, it's always been there, for all I know. Unless you were talking about something else?
if you mean actually on the ha, then I think they've always been there, I can't imagine why they wouldn't give them ears :)
My fisrt thought was that they've always been there, but you hardly ever see them due to hairstyles.
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I've been wearing earrings for at least 2 1/2 years. They've been there that long, at least.