How long is my helmet good for?

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.
It is.