I've done a lot of googling on this one and keep seeing the predictable '5 year rule' but, what if your helmet is over 5 years old and has hardly been used? I bought a new HJC full-face in 2014 and only did around 500 miles with it, before I sold my bike. I've just bought a new bike after 5 years off the road, so dug out my HJC. It is, as you would expect, in perfect condition and looks new to be honest. It's never been dropped or been exposed to any chemicals....and all the other stuff they tell you to be aware of. So it's certainly not had 5 years of use, probably about 20 hours of use in total...and has been stored in its box, in a cupboard for the last 5 years.
So, it pains me to have to buy a new helmet, when the HJC is so 'unused' but I do of course understand you can't put a price on safety. Any thoughts anyone? What would you do?