Wikiage is a free Chrome add-on developed by Jesse. It applies an aging effect to Wikipedia pages, giving users a visual representation of the "staleness" of the content based on the time since its last edit. This add-on is not affiliated with or endorsed by the Wikimedia Foundation, but it works on Wikipedia as well as other Wikimedia Foundation sites like Wiktionary, Wikiquote, and Wikibooks.

Did you know that the average article on the English Wikipedia hasn't been edited in 150 days? With Wikiage, users can easily assess the freshness of Wikipedia pages through a highly realistic aging effect applied to the full body of each page. By visually representing the time since the last change, Wikiage provides a unique way to engage with Wikipedia content.