To prevent insect contamination, store your food off the floor and away from damp places. A study was done at Utah State University in Logan, UT where they tested the quality of dry milk after long-term storage. Here are some of their results. Fahrenheit resulted in minimal flavor changes after 52 months. This study is just one example of the effects that time have on food storage items.
Every food is different.
Keep this in mind as you are rotating the food. Make sure you mark the dates of each so you will be able to keep track of how old the food is.