Most manufacturers recommend changing tires after 7 years (due to rubber losing its elasticity). If I recall, the government says a tire "must" be replaced after 10 years, no mater the condition/wear.
Some manufacturers offers "unlimited warranties" on their tires (Pirelli's P4 has an Unlimited year/135 000km warranty), but I have no idea what happens if you have such tire and they start cracking.
Long story short, a quality tire can last more than 6 years, but the rubber lose its elasticity and it's not recommended to keep em more than 7 years.
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