How old are your speakers

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My Infinity IRS Betas are 25 years old. They are excellent speakers, but they are showing their age. I am looking to sell them once I get enough money to put together a speaker system that can duplicate what they can do. I'd keep them if I could find someone to totally go through them and make them new again. Parts are impossible to find for them.
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I owned Snell Type A ... Several incarnations as well. One of the best speakers ever made, and helped convince me that materials and technology in and of itself is irrelevant. It is about the designers execution and voicing, and personal preferences. I now have quad esl63 speakers, which are amazing.

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Montaldo, I would not completely dismiss the importance of materials and technology in building a speaker.
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Not sure about the exact age of my speakers, but they must be 35 years old or possibly older. Yamaha NS-1000M.

I had been using a pair of the Waveform Mach MC/MC.1 (about 20-25 years old) as my only speakers for a number of years.

I replaced them about two years ago with new old stock, same make and model. If I had to guess, I would say that the old Waveforms had about 85 to 90 per cent of the sound of the new Waveforms. They use Vifa drivers.