Interesting topic, I've been starting to wonder the same thing about my favorite pair of shorts (PI Elite). Have only had them a little over a year, but they have been used for many, many spinning classes and even more bike rides. They, like all of my shorts, have never seen a dryer.

I've been noticing lately that I must use far more chamois cream than at one time, so am thinking that the chamois is finally getting worn or thinning a bit. I've a pair of Terry Liberty shorts, but can't wear it for more than an hour's ride if that long...guess it is time to hit the store sometime soon