Can the term be お姉さんbe used to address female strangers politely?
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It is customary in Japan to address people unknown to you by the respectful,term for the position they would appear to hold in their own family - おじいさん , "grandad", for an elderly man, おばあさん, "granny", for an elderly woman, おくさん, "married woman" for a woman who would appear to be, say, over thirty-five. Not all relationship terms are used like this: おかあさん , "mother", and おとうさん, "father", for example. Also, the age, sex, etc of the speaker affects usage: a young woman might address a middle-aged man as おじさん , "uncle", but I don't think a male of any age would. (I remember the shock I felt the first time a young woman addressed me as おじさん.) おねえさん , "older sister", can be used to address a woman in late teens to early twenties. It is, for example, (or used to be)used to attract the attention of wait-staff in a cafe or restaurant. But all these need to be used with caution. To attract the attention of a young woman who, for example, has dropped something in the street in front of you, it's probably best to use おじょうさん, a respectful word for daughter or young woman. Take care. You can sound very presumptuous if you get it wrong.