How long should high quality speakers last?

My Yamaha NS-2000's are rockin around 35-40 years and still sound great. I bought them off of hifido 7-8 years ago and they went through them. Changed a couple caps in the crossovers and recovered the grills, plus the speakers already had the upgraded surrounds for the woofer.

I do like the marchand electronic crossover and have talked to him.he will answered questions and tailer a build to you needs.enjoy the search.

I'm wondering what is the oldest speaker still playing out there all original with no repairs or upgrades.

Our 1959 Bozaks in our bedroom still look and sound great.  

I know someone with a pair of original Western Electric 753 speakers.  They are both probably from the late 1940's to early 1950's.  They sound really good.  He also has a pair of Western Electric 757 speakers from the same era that I also like very much.