I had to have the foam surrounds of my WATT/Puppy Puppies replaced after about 20 years.
Long time ago, I blew out the midrange of a Rectilinear III Highboy doing stereo wars in a dorm. Duh.
How long does it take a decent quality speaker to "wear out"?
After all, they do have moving parts and capacitors. . . .
(I suppose that "decent quality" s a relative term. FTR, I am running a pair of the older B&W 805s, and for all I know, they may not actually meet the criteria of "decent quality.")