Do Cables Wear Out?

Technically, he is correct, an example being that automotive spark plug wires in 5,000-30,000 volt circuits should probably be replaced after about 100,000 miles. I wouldn't worry about it in your application for the first 75 years or so however, and I think that is being very conservative. IMO.

The regular application of finely particulated Allotropic SnakeOil (TM) from Ophidic Audio Systems will prevent premature depolymerization and breakdown of copper-to-co-valent copper bonds of the basal IC transmissive metallic polymer chain. Most reputable audio tweaks vendors sell this product these days. You should not have problems finding it. Just make sure what you purchase: there are a lot of imitations out there made from low grade fish oil.

OK, so my previous post was in fact complete rubbish. However what is moderately true is that old cable can become slightly oxidized and consequently may loose some conductivity, regardless of the type of music you listen to.

Cables tied to the bedposts perhaps?

Normally for audio use, cables should last until the insulation hardens and cracks or until the copper corrodes away, which is probably of the order of decades... if not centuries.

Since I regularly use my interconnects to whip my girlfriends, the termination on my cables usually lasts no more than a couple weeks before flying apart during a particularly heatd session.