Usually the rational behind having a time limit of 2 years is not that they wear out but that it's a good idea to remove them thY often because with all he heat/cold cycles they can end up seizing up in there and you might not get them out without screwing up the threads and dropping some serious change to have that fixed. If you really want you can just remove and replace to prevent problems. But if you are going through the effort to get at them you might As well replace them.
2011 WK2: Limited, 4x4, Hemi, 730n, Class IV Tow, Brilliant Black. 30% Ceramic Tint, Lockpick, LED DRL, LED License Plate, LED Backup, LED Liftgate (all), Axle/Transfer Case OEM add-on skid plates, Sharkfin Antenna.:thumbsup: