My Elipsa's have grey beards.

Speakers can last many, many years. I think one of the most obvious areas where you notice problems are in the speaker surrounds. They will start to disintegrate and crumble. I know they can be replaced, but you need a great technician.
 
Properly designed and manufactured speakers can last 20+ years no problem. The issue that Joe brings up with regards to driver surrounds drying out and cracking used tohappen a lot when rubber was the material of choice for driver surrounds. Not as much of an issue anymore. If you continue to treat your Elipsas with care there is no reason why they should not last you at least 20 years or so. At that point the one aspect that may need attention are the capacitors in the crossovers, but that also depends on the types of capacitors being used in the crossover design. You should give the fine folks at Sumiko a call and ask them if you have any specific concerns but they should be able to tell you what they think longevity realistically should be and what may need attention after a while, but my estimate of 20 years minimum before stuff needs to be potentially addressed I bet you will not be off the mark.
 
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My A/D/S 300c speakers from 1981 which I put in my first car (a 1976 Buick century). They stayed in that car in the rear deck with sweltering Midwest summers and icy winters for half a decade. Then I used them in college as my speakers. Today they serve as center channel speakers in my home. Still going strong some 35 years later.
 
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