
The1Ryu |
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I can't say for Pathfinder, but in 3.5 Draconomicon it says that the maximum age for a Chromatic dragon is 1200 plus 50 times the dragon's Charisma score. Metallic dragons got double the amount, 100 times the dragon's Charisma score.
I think keeping it 50x for all true dragons works. that ives a Red dragon a maximum age of 2300 or a Gold a maximum age of 2500.
Of course the Draconomicon has a Prestige Class for dragons that makes them nearly deities and immortal. It also says that most evil dragons, always go for some form of immortality rather then just waste away and die. Good dragons tend consume their hoard, or most of it, and either depart to the afterlife willingly or become ghostly guardian spirits of their territory. Some even do this well before their twilight years, as early as when they reach the Old age category.