How long do speakers last?

AR-2ax speakers here from 1966 still going strong and sweet!  This was before AR fitted these with foam surrounds, so the original butyl rubber surrounds are still perfect.  One mid range unit was replaced in the mid-70's ($9) with OEM;  one dome tweeter replaced in 2015 (with perfect aftermarket unit from Parts-Express - $20);  and 4 level potentiometers replaced with L-Pads ($30).  Crossover caps are still fine. Woofer foam surrounds can be problematic after 10-15 years.

i have 4 bose 901 series 2 speakers i bought new back in the day! in 2000 my phase linear 400 power amp fried 3 of them! the 4th, is still original and is still kicking it!!

Speakers can last a lifetime. Recone, recap, etc..

Without having to do anything to them they last exactly 20 years, 275 days, and 30 seconds.

Well, I pulled the trigger, thanks to the "push" (read "good information") from you all. Thank you for the knowledge to be able to make a sound decision on. The clarity (compared to my Klipsch bookshelves) and depth of soundstage if remarkable. On the downside, I'm realizing the limitations of my amp. Must. Get. More. Power. 

Nothing better than an excuse to upgrade my system!