Reporting: Created to completed duration

Is there a way to automatically get a report on task that shows the duration between Created to Completed?

I know there's a reporting from a start date to an end date/completed date,  but we're looking to see more of the aging of a ticket/task from when something was submitted (which, doesn't always mean the task had been started). You can see Created to Completed in a table side by side in reporting, but it's too much to manually do the difference on those every time. 

Cheers!