When one is thinking of Dragons in regards to Solinar, one must remember that they are technically immortal on Solinar.  They can still die as a result of combat or misadventure of course, but in terms of aging, they do not die of old age.  As such, they will continue to grow in power beyond “Great Wyrm” stage of their lives… as detailed below. 

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Dragons on Solinar utilize the rules from the Draconomicon when being developed.  Additionally, each HD of the Dragon will be a d20 roll instead of the more common d12 roll.  This represents not only the vast stamina and toughness of a Dragon, but also the supernatural connection Dragons have with the world that makes them more powerful than almost anything else to walk the lands, thanks to Io.