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Spinster
18-year-old single woman would not be considered a spinster in contemporary language, but a single, 40-year-old woman may be considered a spinster unsourced
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Spinster
http://www.dictionary.com/browse/spinster says a woman who has never married. and http://www.merriam-webster.com/dictionary/spinster under Full Definition of spinster an unmarried woman and especially one past the common age for marrying