We were given a bounty of dried bulk foods when a neighbor moved into assisted living. Included is a 55lb bag of organic whole wheat bread flour that is dated 1999. It was sealed, plastic wrapped and kept in a dry, dark, pest free storage all of this time. I opened it and have found no smell at all, and no rancid taste. The texture seems normal. It does not appear to have any significant bugs- I found a single tiny weevil in my sifting thus far. Apart from taste or pest issues, is there any danger to eating really old flour? I've sifted and frozen a sample; I'm happy to bake a loaf to test for flavor and rise problems, as long as there is no chance of causing illness. Any input?