Q: I own two Shoei RF-1000 helmets that I bought in March of 2008. One of them matched my bike, so I wore it exclusively. Now, almost five years later, its worn in enough to be a loose fit. The other helmet, which Ive never worn, has been stored in its bag inside a helmet carrier in a climate-controlled room. Ive heard you should change helmets after five years. Should I replace my unused lid and buy a new one, or can I save money and feel safe with what I have?