This category is for individuals whose year of birth has never been recorded or is lost to history and never likely to be known (e.g. distantly historical figures).
If the year of birth are presumed to have been recorded and could be researched (e.g. contemporary or recent figures), please use Category:Year of birth missing instead. That is, this category is intended to be mutually exclusive with Category:Year of birth missing (and its living people subcategory), and with Category:Date of birth missing (and its living people subcategory).
