Explore - How to generate a report to show any articles that have not been updated in the last 1 year?

I'd like to report any articles that are growing old, or out of date. This will ensure quality control in that our library of articles are not growing out of date, or no longer irrelevant. I wouldnt want the answer bot, or our users to reference old articles that are no longer relevant. How can I report on all my articles, and display how long its been since they were last edited. 

I would need to either sort by last edited date.
Or I would need to filter by last edited date.