How to delete files in a document library after x hours, days or months

Summary of Issue

I ran across an issue at my company where I needed to delete items in a document library that were older that 30 days.  Why reinvent the wheel when it has already been invented.  Thank you goes to the authors of the following posts.

Tested

September 2009

Sources

• Brainlitter.com
• the SharePoint Redemption