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This information is spot on

Unless exposed to a lot of heat or a lot of direct sunlight, EPS will not degrade to any significant extent in 3 years. Your sweat (because of the body oils) will attack it somewhat, but not very much. When EPS has degraded, it will be punky to the touch and deform easily under pressure. And even then, this will only happen in a very shallow depth. Your helmet will crap out due to pad failure, strap failure, weakened shell, getting skunky, etc. long before the EPS foam deteriorates.
 
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