I have a batch that is nearly 10 years old (yeah, I know, rotate your stocks! The jar somehow wound up behind a stack of wood.). Had it tested - got a friend who works in a hospital lab, and it was fine. Still edible, though there isn’t much taste left.
This jerky was vacuum packed, then the packs put into a brown glass mason jar and sealed with an O2 absorber and a sachet of silica gel.
Good info...thanks!