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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Box speakers???

Who knows?

My Magneplaner Tympani I-C speakers have been with me since I owned my shop in 1976.  They are as good if not better than ever.

With box speakers, you have cones and other stuff that degrades.  With Maggies, you have the glue that can go bad.

Other than that, I have no idea how long mine will last--45 years and counting!

Cheers!
Mine are over 62 years old and still doing great.  I did have a friend that had some surround failure on his JBL L-150's.  They highly suggested to keep it out of direct light.  UV is not a friend.  At the very least use your speaker covers. 
B&W 801 Model 80 FC lasted all these years. The ferro fluid can dry out in the tweeters of this era. 1980 until now is an impressive run.
In 1972 my wife and I bought a pair of Bose 901, Series 1.  That was before Bose started using foam surrounds. They still play in our son's basement party room almost fifty years later.