High quality speakers should literally last a lifetime or more provided: (1) the user does not damage them, and (2) they're kept in a suitable environment free from extreme temperatures and moisture (i.e., indoors). I have a set of Klipschorns that are pushing 50 years of age and they are still performing as expected.
How long should high quality speakers last?
My Zu Omen Def MKii (rev B) are going on 13-14 years old. The speakers sound wonderful. I have no intention of parting with them. The speakers came with the latest ZU tweeter design. How long should I expect the speakers to last without any issues? I do not abuse the speakers and run them with my Luxman 595ase amp.