You can check the total number of pages fed through the printer. The information is shown on the nozzle check pattern.
Select More on the printer's control panel.
To select an item, use the 
buttons, and then press the OK button.
Select Maintenance > Nozzle Check.
Follow the on-screen instructions to load paper and print the nozzle check pattern.
You can also use the printer driver to check the total number of pages fed.
Windows
Click Printer and Option Information on the Maintenance tab.
Mac OS
Apple menu > System Preferences (or System Settings) > Printers & Scanners (or Print & Scan, Print & Fax) > Epson(XXXX) > Options & Supplies > Utility > Open Printer Utility > Printer and Option Information