Recently (past 5 years) some cable manufacturers have incorporated "newer thinking" in their power cable designs. These have, in some cases, resulted in a 2x improvement in performance vs cost. Even considering cable prices increases of 40% (or, more) the sonic bang-for-the-buck can still be better in newer cables vs old. So, even if your old cables are immaculate, and still sound incredible to you, it might be worth auditioning something newer. You can always return it.
For you power cable deniers out there, this post is probably going to peg the needle on your B.S. meter. That's cool. You can just go check the ignition timing on your Tesla. Or, something.