The word everyone is a singular indefinite pronoun. But while tagging, why its subject pronoun is they which is plural? e.g.
Everyone wants to live, don't they?
Here, in the statement, the subject 'everyone' is a singular pronoun and it has used a singular verb 'wants'. But in the question part, the word 'they' is the subject pronoun of 'everyone' which is plural.
Why? Please explain.
This question is not a duplicate of Using "they" in tag questions with everybody / nobody etc. Because I want to know the reason of using plural subject pronoun in the case of singular pronoun as a subject in the statement.