Articles in category contain statements that may become dated originating from before 1990. The statements may need to be updated, removed or edited for perspective. Articles containing older statements are more likely to be dated. Not all articles included in this category will need updating at this point in time.

This is a maintenance category, used for maintenance of the Wikipedia project. It is not part of the encyclopedia and contains non-article pages, or groups articles by status rather than subject. Do not include this category in content categories. This is a hidden category. It is not shown on its member pages, unless the corresponding user preference (Appearance → Show hidden categories) is set.

Use {{As of}} to mark all individual statements that may become dated, this will automatically add them to the appropriate categories. Wherever possible, use {{Update after}} to mark exactly when statements will need updating in addition to using {{As of}}.

• Wikipedia:As of for details of dealing with statements that date quickly.
• Wikipedia:Avoid statements that will date quickly for guidelines on using precise language when dealing with information that may date quickly.
• Category:Wikipedia articles in need of updating and the accompanying {{Update after}} template.
• Category:1911 Britannica articles needing updates