Show document age in search

I have a received a requirement to show a documents age on a saved "discovery" in a dashboard - so if the document was timestamped an hour ago, the field would show 1 hour.. I took a look at a scripted field but expressions do not work l with dates nor do they have a concept of "now". Am I missing something obvious?


If you can show what you have tried, perhaps someone can point out what you may be missing?