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It is commonly believed that the lifespan of a dragon is one thousand years.
As for whether this is credible, Liszt has no way to discern the truth and can only tentatively believe that this information is real. Before the age of one hundred years, a dragon is considered young, from one hundred to eight hundred years old a dragon is adult, and after eight hundred years old, it becomes an elderly dragon. Elderly dragons leave their living area to fly to the Valley of Dragons.
What he can discern now is that dragons do not necessarily die in the Valley of Dragons—an Evil Dragon could be killed by a Dragon Slayer. The Fire Dragon of Black Horse Island belongs to the Evil Dragons, and its death was mysterious; it may not have died of old age but possibly was murdered.
Then again, even if a dragon dies, it seems to be capable of resurrection, its life appearing to be a cycle of rebirth.