Why a plugin?
I’m assuming that someone else out there will find this useful. I’m sure plugins like this exist already but, if they do, I can’t find them.
For an example of what the plugin looks like when it finds an outdated entry, please see this article: Move ExpressionEngine to a different server (and yes, the content there is actually outdated).
Can I get it?
Of course you can. If you want to download Entry Age and try it out, you can head over to my GitHub page any time. 🙂 Entry Age 1.0 on GitHub.
Hope it helps someone.