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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It would be interesting to ask the company how they believe their speakers  should last?
 If you do and get a reply, please update us.
Check the wiring.  PVC is a commonly used jacket material. It continues to outgas over decades and the chloride oxides copper. 
Bought a pair of ADS L810 II's in 1978. Used them until about 5 years
ago. Passed them on to my brother and as far as I know, still making sounds. Only issue I ever had was blown tweeter fuses when my worthless step son used them while I was at work,
I have a great pair of Advents from 1972 that had virtually no foam left. Got a couple of OEM woofers (an expensive fix I admit) and now I enjoy the sound I remember from way back when.The cabinets show their age but are still solid. Watch for foam loss and tweeter breakdown and 50-year-old speakers are possible.
just got me thinking

there is plastic in the oceans and landfills that are supposed to last 1 million years

why can't they make speaker driver surrounds with that cr%p?

just like black boxes on airplanes...  🙃