Seriously, you discard an oven when it breaks, which implies as well that it is unsafe to use. If it works and is safe to operate it, you can continue using it, regardless of how old it is.
When should you discard a PFD?
For baking bacon in the oven, you should preheat the oven to 400F (200C).
Anually
Discard and replace it - do not attempt to fix it
You should cook meatloaf in the oven at a temperature of 350F.
Bacon should be cooked in the oven at a temperature of 400F.
When is torn or has torn straps, discolored.
Abdi
When is torn or has torn straps, discolored.
YES
Cooked turkey left in an unwarmed oven overnight is not safe to eat, as it can enter the "danger zone" (between 40°F and 140°F) where bacteria can proliferate. The USDA recommends that cooked food should not be left out at room temperature for more than two hours. If the turkey has been left in the oven for longer than that, it's best to discard it to avoid the risk of foodborne illness.
You should cook a pork tenderloin in the oven at a temperature of 375F.