Most medications will have about a 2yr half-life. Assuming you stored yours at room temp out of direct sunlight, yours should still be good. Since the pellets had just expired, and yours is older, you may have lost a few % potency, but nothing noticeable if at all. Hit that shit bro! For source info like source checks, veterans or MODS. For other source stuff, it's not allowed to talk about on this board, so don't be careless in what you ask.