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konastab01
EPS foam which is the most important component of a helmet, has no appreciable degradation over time (study of bicycle helmets but it's the same material)
It doesn't harden or lose absorbtion or react to sweat or body chemicals. It is affected by UV light but your helmet's outer shell is solid plastic and doesn't let any through so providing the helmet hasn't been dropped and has no cracks, 5 years is an extremely conservative life span estimate and should be taken with a pinch of salt from manufacturers who want you to buy more helmets.
IMO