I can tell you that powdered ginger is nasty after 5 years sitting in the container. Toss it and buy a new one, or grow some and use it fresh.
Also, chili powder is profoundly unremarkable after 5 years sitting in the container. Another one worth ditching and replacing every year or so.
Cardamom pods seem to maintain a good flavor, but the powder gets lost after awhile. Best is to buy the pods, and crush the seed within the pod when/as needed. Same with allspice.
Cinnamon sticks can effectively be good forever. Grind as needed, or "score" a piece of the bark with a knife to release the oils that are trapped in it, as needed.
Garlic powder is weird. Never use the stuff. I grow my own oregano, lemon thyme, and rosemary, so I can harvest a year's worth after a week's growth, here in Florida, if I wanted to. Mostly I just let the thyme and oregano flower because they're pretty and attract honeybees.
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