Geras in Greek myth was the daimon (evil spirit) of old age, and with his power you can produce numerous effects, both good and bad. You don't possess eternal youth, but rather are incapable of dying of old age. In addition, you are capable of afflicting others with old age (and the asociated conditions, like arthritis, memory loss, lowered stamina, strength and reflexes, etc. ), and afflicting those who are already old with mind-numbing senility, which lowers cognition and induces delusion.