Drivers dont wear out, with exception to the suspension, especially those that use foam surrounds, and odd spider materials (or whatever the proper name for that part is...I came from car audio, so I just use that terminology).
One of my favorite speakers was a Sansui SP-35....that thing was older than dirt...I think it had a 1963 manufacture date. I sold them when I moved from Indiana to California in dec 2000, and they were still going strong. Nearly 40 years...and I really wouldnt be surprised if they could do 40 more.