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just to add to Stephen's answer, if you're open to solutions from the Atlassian Marketplace, this would also be easy to do in the app that my team is working on, JXL for Jira.
JXL is a full-fledged spreadsheet/table view that allows viewing, inline-editing, sorting, and filtering by all your issue fields, much like you’d do in e.g. Excel or Google Sheets. It also comes with a number of so-called “smart columns” that aren’t natively available, including "time since updated". This column can be displayed in different formats, including the number of days.
This is how it looks in action:
It's worth noting that JXL can do much more than that: From support for configurable issue hierarchies, to issue grouping, and conditional formatting. You can also export your data with just one click.
Since you've tagged your question for Jira Server: While Atlassian doesn't allow new apps to be listed for Jira Server in the Marketplace, JXL is still perfectly compatible; it's just that we need to generate a license for you. If the above looks interesting, just let me know and I'll happily start a free trial for you.
Hope this helps,