How to report on dates 'greater than xx days' please?

Trying to see if there is a way to create dynamic reports for sales dashboards based on date fields to display 'greater than xx days'.

I naturally assumed this was possible and common requirement, but can't find a way to do this using Sugar reports, only Advanced reports which cannot be added to Dashboards and not easy for users to choose their own xx days.

Any ideas welcome.

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