The Google internal wiki system solves this by showing you when the last update was and when the last review for staleness was. A user is assigned as the owner

The Google internal wiki system solves this by showing you when the last update was and when the last review for staleness was. A user is assigned as the owner for a document. They get pinged when the article hasn't been updated in X months. They look it over and fix it, and the cycle starts over.