I'd suggest there are too many variables to give a specific length for how many years tires are good for. A tire that is subjected to a number of worse case scenarios like being subjected to harsh sunlight, under inflated, cheap tire to begin with etc may be darn lucky to make it 4 years. On the other hand tires that are properly maintained, stored inside, better rubber compound etc could easily go longer according to info on tire manufacturing web sites.
So might be better to suggest a range of life say 3-6 years depending on the variables. Of course always better safe than sorry as in eating leftover food and riding on questionable tires.
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