My Nolan N103 was made in 09 so it's now at the five year mark the recommended replacement time. The helmet has never been dropped and is in pretty much perfect condition. Do you really believe in the five year rule? Do you think it's the helmet makers that decided you need to buy a new one every five? My liner is very worn so now is the time to either replace the liner or the helmet. I don't want to replace a perfectly good helmet is it's not necessary.