The best way I know to get really old, almost dead seeds to germinate, is to very carefully crack the shell, and remove the whole, intact nut from inside. Then, using a 10:1 water/coconut water solution, soak them a day or two, then place in moistened paper towel, rock wool, or whatever your usual, preferred method is. Seeds have embryos (cotyledon, the first tiny leaves) feed the plant, just like an egg has an embryo to feed a critter, until the tap root is established well enough to feed the plant itself. The older and dryer seeds get, the weaker, and smaller their cotyledon becomes. You can tell after germination, the cotyledons on old seeds are small, shriveled, and weak looking. The barely have enough food to survive. By removing the nut from the shell, you save the seed all that energy it takes to break out, and put it straight to establishing a root system. Good Luck! I just started some from 2004, and they’re doing great!