In Europe for motorhomes , Michelin advises to let your tires be checked on aging by a specialist, after 6 years every year. Prefentively renew them after 10 years. 2 years of profesional storing, can be sold as new. This could sometimes mean , only after 12 years after DOT-date preventively renewel.
Only institutes that represent comerce, like BOVAG in the Netherlands( where I live) advice/ prescribe renewal after 6 years, and its vague if its after DOT date or first use.
If pressure is kept high enaugh, and protected against UV- light, the tires can mayby even last longer.
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