How long do good speakers last?


I just ordered a set of Sonus Faber Olympica Nova Vs, my first foray into nice speakers. I turn 51 this month and am hoping these will be the last speakers I ever buy. But it got me to thinking - how long should I expect these speakers to last? Or any good speakers for that matter? Does the foam eventually break down? Issues with general wear and tear? Appreciate your perspectives!
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My PSB Stratus Gold I are going on 15+ years and still are in great shape . No change in sound and no woofer surround rot , so far.
My audio life got real when I heard a pair of Montana speakers being driven correctly by a huge Threshold amp. It was in the 90s. Incredible sound. Someone on the forum tonight said they have Montana's. What a speaker!
Vandersteen model 1B player the crap out of them 25 years long. Fortunly they have the rubber instead of foam edges an they have a abuse circuit that kicks inn if needed. When aging an lately applied room correction they sounds better an better.
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