How long do high quality speakers "last"

I have a pair of Kef C55 that were purchase about 1990 that still sound fantastic. They have taken quite a beating, too.

I expect my Silverline Preludes to really last as they have magnesium/aluminum drivers and rubber surrounds. The crossover caps may die before the drivers, but I’ll likely get bored and replace the speakers with something else due to boredom or curiosity well before any of that. Note that I use my trusty old Boston Acoustics A60IIs in my TV system and have replaced the woofers once (foam degradation). years ago…they still kick a--, so to speak (from 1988 or something?). I assume the ferrofluid will dry up eventually in the tweeters but so far they work fine.

The question responders should ask of the OP is, physically or technologically.

Larry

An important issue for me,as I'm retired and can't really afford to replace myDaedalus Audio DA-RMAs, which I love. I am reassured by remembering my first ever speakers bought in 1966, second hand, were still in use by my late lamented Mother, when she passed in 2012. Now that is'nt to bad.

The RMa's don't use foam surrounds, so I would investigate using a high quality rubber preservative on the butyl every 2 or 3 yrs or so to keep the butyl from drying out (micro cracking) and will help keep them pliable...there won't be any change in sound or performance when you apply it or anything, but it's a worthwhile investment for what little it costs. Be sure to keep your speakers out of the sunlight, even through glass. Not only will it begin to mar the finish over a decade or two, but if you leave your grills off it will slowly degrade driver materials and surrounds as well, IME.

If you're worried or just want to know what your fall-back options might be, give Lou Hinkley a shout and see what he offers in the way of refurbishment (or what drivers or materials he'd likely be able to send you, if you can do that sort of thing yourself)...it might be well cheaper than replacement if push came to shove.