We had this discussion on my blog once already. But anyhow, since it's one of my personal grammar crusades, here's another article on the history of using “they/their/them” as the first-person singular instead of the contemporary but much more awkward “he/she” convention.
“…for most of the existence of the English language, ‘they’ was used
as the accepted singular gender-neutral pronoun. The use of ‘it’ was
reserved for objects, as it is today, but for people the pronoun of
choice was they/their/them.
So how did this all change? Courtesy of the English Parliament.”
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