Is there any noticeable difference in sound quality if you use a new XLR cable instead of a well-used 10 years old one?
I work at our local church and can borrow a cable from there to do some recording for a short film instead of buying it..
If you use a new crappy cable, it's going to sound worse than a well-made and cared for high-quality cable that's 10 years old.
But by the same token, a well-used workhorse cable that's been cared for properly for 10 years might not sound as good as something studio-grade.
Age really has nothing to do with it. Quality, construction, and care are what matter here. When care is absent, then age makes a difference--but that would be visually noticeable.