How long is my helmet good for?

JBurch said
If foggy memory serves me right, Snell foundation up dates their standards every 5 years, so ( for arguments sake ) if your helmet is Snell 2015 standard, next up date is 2020, so ( again foggy memory ) rule book states that helmet must be current or previous standard; 2025 standard will render your 2015 standard helmet unusable.

Does this help?
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Snell Foundation says that helmets should be good for at least 10 years, but they RECOMMEND replacing them every 5 years. If my SA2020 is good until 2030 then I am fine with that, I just can't get anyone from the IHRA to come out and say it! I'm wondering if it is a bit of a scam like harness certification.