Stop Aging:

If successful, a character ceases to age entirely, as long as the spell is maintained. If the character is considered elderly, this is removed. Immortal characters cannot have their health state increased via non-artifact, and non-spell means. If an immortal character who would be considered elderly becomes mortal once more, they immediately die. When an immortal ruler character dies, their nation suffers -1 temporary Karma per session they were alive. The upkeep of this spell increases by 1 at the end of every age.