If well stored and with undamaged packaging, it can go for years without trouble. With bff products i generally go to groceries stores and look for a section dedicated to these products. They sell them cheaper and are completely safe. Good way to save money and fight food waste.

As they said, generally no, they may just not taste as good.

For example - a pot of chilli powder probably will be fine after 5 years unopened in a cupboard, but probably won’t be as spicy as it used to be.