Hard to tell. The obvious risk with old ink, especially if it has literally sat still for 7 years, is that the pigments have started to clump a little. This will cause nozzle clogs.
This is of course only a concern with pigment inks; dyes are soluble. Although in a dye ink, there's also the possibility of certain adjuvants somehow coagulating, sliming up etc.
Having said that, I've fed my pigment printer even older ink on occasion, and apart from an innocuous hiccup or burp (not necessarily related to the ink's age), it ate it up just fine.