I have long been pushing for the acceptance of “they/their” as the gender-neutral third person singular pronoun, and I am delighted to discover (via fabulousness) a site that nails down its credentials so thoroughly it might shake even the ossified beliefs of William Safire:
These files contain a list of over 75 occurrences of the words “they”/”their”/”them”/”themselves” referring to a singular antecedent with indefinite or generic meaning in Jane Austen’s writings (mainly in her six novels), as well as further examples of singular “their” etc. from the Oxford English Dictionary (OED) and elsewhere. While your high-school English teacher may have told you not to use this construction, it actually dates back to at least the 14th century, and was used by the following authors (among others) in addition to Jane Austen: Geoffrey Chaucer, Edmund Spenser, William Shakespeare, the King James Bible, The Spectator, Jonathan Swift, Daniel Defoe, Frances Sheridan, Oliver Goldsmith, Henry Fielding, Maria Edgeworth, Percy Shelley, Lord Byron, William Makepeace Thackeray, Sir Walter Scott, George Eliot [Mary Anne Evans], Charles Dickens, Mrs. Gaskell, Anthony Trollope, John Ruskin, Robert Louis Stevenson, Walt Whitman, George Bernard Shaw, Lewis Carroll, Oscar Wilde, Rudyard Kipling, H. G. Wells, F. Scott Fitzgerald, Edith Wharton, W. H. Auden, Lord Dunsany, George Orwell, and C. S. Lewis.
Singular “their” etc., was an accepted part of the English language before the 18th-century grammarians started making arbitrary judgements as to what is “good English” and “bad English”, based on a kind of pseudo-“logic” deduced from the Latin language, that has nothing whatever to do with English. (See the 1975 journal article by Anne Bodine in the bibliography.) And even after the old-line grammarians put it under their ban, this anathematized singular “their” construction never stopped being used by English-speakers, both orally and by serious literary writers. So it’s time for anyone who still thinks that singular “their” is so-called “bad grammar” to get rid of their prejudices and pedantry!
Incidentally, this is part of Henry Churchyard’s linguistics page, which also contains his dissertation, Topics in Tiberian Biblical Hebrew Metrical Phonology and Prosodics, as well as “The vowel system of a reconstructed 18th-century proto-language ancestral to modern ‘standard’ English dialects in both England and America,” Twain’s hilarious “The Awful German Language,” and a couple of other things.