Go to Reports → All Reports and choose Receivables aging under Financial statements.
Set the date range at the top.
Each row is a customer. The columns show Not due yet, then 0–30 days, 31–60 days and so on, up to Over 360 days.
Click Export to download it.
Tips
Follow up first on the oldest columns. The longer a debt waits, the harder it is to collect.
Turn on invoice reminders so Tyms chases customers automatically.
For more detail, see Sales by customer and Customer cash flow under All Reports.
A customer listed that shouldn't be? Check for unrecorded payments under Manage payments.