The 600-Year History of the Singular 'They' (2022)
(mentalfloss.com)
For evidence that language is constantly evolving, look at the history of they. The singular form of the pronoun, which has become mainstream in recent years, can describe individuals whose gender isn’t specified—replacing the clunky he or she—and is used by nonbinary people who identify with the pronoun. The AP Stylebook has accepted such functions of they, them, and their since 2017, and Merriam-Webster made the singular they its word of the year in 2019.
For evidence that language is constantly evolving, look at the history of they. The singular form of the pronoun, which has become mainstream in recent years, can describe individuals whose gender isn’t specified—replacing the clunky he or she—and is used by nonbinary people who identify with the pronoun. The AP Stylebook has accepted such functions of they, them, and their since 2017, and Merriam-Webster made the singular they its word of the year in 2019.