It depends how you stored it. If you left it anywhere where light/heat/air can get to it, the weed will lose its potency after time. If you stored it correctly like in a jar or plastic container somewhere cool and dark, it will keep for quite a while and maybe cure more. I've heard some people say that storing weed for a long time makes it smoke smoother but I don't know. I wouldn't have the will power to leave a container full of weed sitting there and not touch it; how about you?