Is there any use of these on StackOverflow? I think these should be deleted.
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yes-no is used for different purposes: from boolean fields, to dialog boxes, GUI elements, yes/no questions, and boolean settings. It is used with too many purposes to be useful, and in most of the cases knowing that the question is, for example, about yes/no questions rather than other type of questions is not relevant.
old is used to generically say the question is about something old, which is not relevant for a question. Would we tag old all the Drupal 5 questions, or any questions about a old version of any software?