it will likely have degraded a lot of THC into CBN, rob make your sleepy and drowsy. also may not taste the best but if its all you got then try it out.
Terpenes should be gone long time ago and depending of how you store it, as m0use say, you should get a lot of CBN (any pictures of the trichome from a microscope?).
The kind of stuff you could mix with fresh buds before going to bed. :3