That should be 10 years, usually company policy that they'll refuse to fit it beyond 10 - covering their heinies. Tires do rot.
Sure they'll try to sell you new tires at 5 or 7.
Tires do lose pressure. Everything loses pressure over time, even Pepsi bottles (especially when heated).
I check'up every few months, and especially before a trip of any distance maybe >100 miles.
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