Beans too old before roasters roast ?

So this winter I have purchased different beans from a couple of roaster's and rested well. But they are roasters that I never used before. I notice only some of them are transparent in showing that their green beans are sitting for 2 to 3 years,or dates they received the kilos before roasting.They have been tasting horrible and un drinkable, all my pounds down the drain no matter what I would do. Over many years I never had so much problems. Changes I made were, different temperatures, different filters, different grind size, different kettle, different brewer. Etc. they never smelled sweet or good and always or either a bit overextracted tasting or no flavor at all and I changed every variable humanly possible that is why I think it is the beans being old and sitting too long over these long winters, and the quality has suffered. Because my coffees are usually perfect so by trying all these other things the only thing I could think of is the beans are too old.Can anybody tell me what they think and give me a suggestion on not buying bad beans and throw them out some of the roasters are kind but most not so much. It isn't that I don't like the flavor it's at the coffees just taste terrible! Thank you in advance.
fairly experienced @#?@$