The Aging report will show you a median of aging periods for your cards, that is, for how long the cards are in a specific status.
This is an example of the Aging Report:
The indicators show in this example are:
Completed: the time it took for the cards to me moved to completed status)
All open: for how long are the cards still in non-completed status
Open < 1 day: for how long are the cards still in non-completed status and were created less than 1 day ago
Open 2-7 days: for how long are the cards still in non-completed status and were created 2-7 days ago
Open 8+ days: for how long are the cards still in non-completed status and were created 8 or more days ago
Instead of calculating the age based on the "Creation date", that is, the date when the card was created regardless of its status, you may also view this report based on "Scope date" (status = open) or "Started date" (status = started).
Another possibility of this is to show the view based on lists, board, member, milestone or label.
This information will be useful for you to make better decisions on where to focus in your schedule management process.