Documentation for JIRA 5.2. Documentation for other versions of JIRA is available too. 
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The 'Average Age' report is a bar chart showing the average age (in days) of unresolved issues at given points in time. The report is based on your choice of project or issue filter, and your chosen units of time (ie. hours, days, weeks, months, quarters or years).
On this page:
The report generated will look something like this:
Screenshot: 'Average Age' report
If you use Internet Explorer, you will need to configure your browser to be able to print pages with charts correctly: