I have three basses and only one of them seems to have aged. I actually kind of like a beat up look to basses because it gives the bass character. Though each one of my basses seems to age differently. I have a Fender American standard jazz bass, and for the past three years I don't think it's aged whatsoever. There's maybe one or two scratches but no finish issues (which is usually good since that's what Fender was aiming for). It makes me think just how much bassists like Flea have played on their basses to bring them to that kind of shape.