Like GreenLantern speculated about con having an effect, I think this is true. Also there is aging gear, withering shaman pcs and npcs, someone once told me drinking alcohol had an effect on all non-bard classes, metabolic quickening.... I think there are other factors as well. Add it all up and you have a lot of things to chip away at those seemingly absurdly high lifespans they put in the helps. Idk, just my 2 cents. I would like to know the real answer.