iPod classic: lines on screen

I have an iPod classic. It's about 5 years old, but still in good condition. The other day, I noticed some horizontal lines had appeared on the screen. They're not scratches or anything...they're like pixely lines, and they remain no matter what screen I go to. Is there something I can do about this, or is it a problem that just comes with age? Any help would be greatly appreciated. Can Apple still cover it if my warranty is long passed?