How old is your old helmet? They don't last for ever. That is, after a few years their ability to protect your head is compromised. Most manufacturers recommend replacement within 3 - 5 years (or immediately if involved in an accident). Even when being frank, 8 years is the max. Just thought I'd mention as it could save you the trouble of replacing your liner!7. I have an old LAS helmet, and the liner is falling apart. I bought a new liner early last season (2013) but still haven't tried tearing the old one out and swapping in the new one.