longevity of good speakers


i am somewhat new at the audiophile game and i am looking for some advice on speakers. NOT SUGGESTIONS. my question is in buying a high caliber speaker like the verity ovations on the used market, with average play, approx. 20 hrs./week, how long can they be expected to play at their top form? in other words, if i buy a six year old set of good speakers, how long could i realistically expect them to give me great satisfaction?
128x128mpmll
Vintage speakers were made a lot better and will last a lifetime....I love my sansui sp-5500 horn speakers with cryoed inside wires and all crossover parts cryoed!..Now all I need to do is put some of Alan Maher's CBF crystals on the crossover parts. Someone over on the audio asylum forum said these crystals works great inside the shells of a ac plugs and ac IEC connectors. He said it improved audio and video A LOT!...They now sell the crystals in bulk by the pound!
I have a pair 25 year old Wharfedale Diamonds. I had to do a little glue repair on the dust caps. The tweeters look like ones you could replace for $6 bucks- for the pair! No one can believe how good they sound.
Foam deteriorates, some people replace caps, but old cared for speakers should last a long long time.
I need to get some of those magic crystals for sure!!And a smart clock and a few call-in tweeks and some stones and a few of those twisted tuning forks,etc.
I forgot to mention I keep all of my speakers in special pyramid structures with crystals hanging inside.
One of my pairs of speakers is 30yrs old and sounds wonderful. The other is 13-14yrs old and sounds wonderful too.