Why do other women my age talk to me like I'm a young girl?

I'm 20yo and I've been trying to make friends lately but I noticed most women treat me like a girl, I mean it's sweet but it happens with women my age too lol And I don't think they're being mean or anything like that, I don't know why this happens, it's kinda weird XD
Why do other women my age talk to me like I'm a young girl?
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