This comes up from time to time. Capacitors go over time; 15-25 years. The other important thing is consistent humidity. Too wet and stuff rots, rusts and shorts. Too dry and the enclosures can warp and come unglued, and the driver cones can deteriorate more rapidly, based on their composition.
How long do speakers last?
I ask because I have an opportunity to buy a pair of Von Schweikert VR-33's for an insanely good price. I get it: "it depends how hard they have been driven", but judging by the condition they were very nicely taken care of. My only concern is that will need repairs in the future whereas I could just spend that money on new speakers. On the other hand they sound fantastic. Just curious about the lifespan. They'd be a nice upgrade from my Klipsch bookshelves / sub combo.