Raven foods give a shelf life of three years, I think that is a bit mean, as there is nothing to go wrong with the food; it was packed in a nitrogen atmosphere, has less than 2% moisture.
Kept cool and at a stable temperature, most dehydrated foods last 7 to 15 years, without going bad. They might be flavourless, and of little nutritional value, but I doubt that they will do you any harm.
If the shelf life of Raven dehydrated food is judged on the same basis as that of MRS, the shelf life is determined by solely the taste of the food and not the nutrition of the food after prolonged storage