I have a 02 954 with 27,000 miles on her and she doesn't miss a beat. I have had guys ride my bike that have newer models and say that my bike feels better and newer than theirs. Obviously some of these people don't take care of their bikes very well. All I do is trackdays and ride aggressive in the twisties, so I am by no means easy on her. It's all about how you take care of your machinery. I have a friend that just tears up bikes in less than a year because he just doesn't care. If you take care of these machines you probably don't have much to worry about till you get over 60,000, with the exception of regular maintenance and wear and tear parts.