Two of mine were 3-4 yrs old like yours and they looked just like that. You'll be fine. (although I sold mine after about 15k miles or so. I guess I'm not the most reliable source )
Trails are comparatively SILENT which I LOVE. They perform very well Offroad, look great, etc. They are everything I wanted .Thanks fellas, I aired down to about 40psi a couple days ago just because.
@Lurch, how do you like the Trail Graps vs the Muds?