^yup, i've spent a long time trying to find out...I know the typical 3-5 years (some people say longer), but there is a lack of info about whether amount of usage/storage affects longevity.

I assume that if I keep a helmet in my closet for 3 years, it'd be basically good as when I originally put it there--I mean the worse I'm subjecting it to is fluctuating 45-90 degrees F temperatures