"A particular lady of quality is meant here; but every lady of quality, or no quality, are welcome to apply the character to themselves." - Henry Fielding.
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Not by today's standards, but that quote is from 1743.
— Mister Micawber
Not by today's standards, but that quote is from 1743.
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And this is a somewhat similar contemporary example:
"I usually spot a Liberal Democrat or a conservative Republican at one hundred feet, and I have no trouble at all when they come close enough so I can hear them talk." - And More by Andy Rooney, 1982.
'They' is widely accepted as a gender-non-specific singular pronoun these days. Only an increasingly small circle of traditionalists insist that one should use 'he or she' in its place. 'He or she' often sounds awkward. 'They' is certainly acceptable in informal contexts. In formal contexts, the best choice is probably to re-cast the sentence entirely - thereby avoiding the issue.