Stale News Warning is a Chrome extension which warns you when you are reading an old news article.

Currently supported: BBC News, CNN, Daily Mail, The Guardian, Huffington Post, The Independent, India Times / Times of India, New York Times, Sky News (UK), Stack Overflow, The Telegraph, Yahoo News, Yahoo News UK

https://chrome.google.com/webstore/detail/stale-news-warning/leimdfebooadifmdaofhjkplmpiimlpg