My helmet is 3-4 years old. I have not been in an accident (knock on wood) and with three young kids and a busy job, I'm not exactly riding with great frequency. The bottom line is that the helmet is in like new condition. My LBS recommended that I nevertheless buy a new helmet because "after a couple of years, the foam breaks down and the helmet loses its ability to protect you in a crash." Have you ever heard of this or is this just a sales scam?