This might be a silly question, but how long do pups last? What goes bad? Magnets, wirings, castings? I'm asking because I've found a guitar that I really, really like. You know how when you have a new guitar always fiddle around to find out what sounds you can get out of it. Well, I'm blown away by the sound it produces. This is probably from lack of experience but it's like nothing I've played before. The pickups in it are now 38 years old and long since out of production. I was thinking that maybe I should find a spare used set. Then again I guess they would age the same not being used?