The original version of this category was CfD'd, at Wikipedia:Categories for discussion/Log/2007 February 14#Category:Date of birth unknown with a rather marginal declaration of consesus to delete. Things have changed significantly since then. The sister category, Category:Date of death unknown, has remained viable, used, and un-CfDed. The C:Dobu deletion nominator's rationale is now well covered by the documentation of this and related categories, that they need not be applied to ancient historical figures (Category:Year of death unknown already covers them), and most importantly, CfD has much more recently than that deletion debate come to the consensus that cleanup categories of a non-"definine characteristic" nature should not be placed in articles, but unobtrusively on article talk pages. This allows WP:BIO to have its useful category, while not leading to the "category clutter" on article pages feared by the deletion nominator. While this is in some sense technically a restoration of previously deleted material, this category is not subject to WP:SD, but should instead be WP:CFD'd again if someone feels it should be deleted, because the entire nature of consensus on such categories has changed drastically since the original CfD on Category:Date of birth unknown. — SMcCandlish [talk] [cont] ‹(-¿-)› 12:39, 27 May 2007 (UTC)
Should not go on articles but on articles' talk pages
Resolved:Consensus at WP:CFD is that this belongs on talk pages.
This is an administrative category that is of no value to readers, so it should really be on the talk pages. Alex Middleton 17:04, 14 May 2007 (UTC)
Yes, this is precisely the conclusion that WP:CFD arrived at; it is considered "non-defining". — SMcCandlish [talk] [cont] ‹(-¿-)› 16:11, 27 May 2007 (UTC)