I recognize that stores and manufacturers are going to recommend replacement at relatively frequent intervals for their revenue. I also recognize that with each passing year or so, improvements in helmet design and standards improve their ability to keep the wearer safer.

My current helmet may be 5-6 yrs old and has never been in an accident. I may have dropped it off the rear rack or handlebars a couple of times but no where on the helmet are there any visible cracks in the outer plastic shell (nor can I feel any), nor in the foam either.

Am I risking my safety by continuing with this helmet?