Does not apply to me. Miles don't compute on hardtails. They're ridden for fun, not to build endurance. I ever get rid of my aversion for wearing lycra and skinny tires maybe I'll change my mind. Money and actual wear and tear carries a greater weight than age. I retired my 2003 Trek 4900 because the cost of a having a whole new groupset installed was more than the cost of a new bike that had better brakes and suspension. I also discovered that they size was a bad fit for me too. I wish I could buy more cartilage too though, but apparently those upgrades are well out of my price range.