Corruption, most likely.

[Given the evidence of legion weapons with their leader, and how they were tearing apart their own once carefully cared for home]

Heh, I meant your natural lifespan- not if you'll survive the war. Dragons can take over a century to mature, depending on the breed. [Seeing some creep towards him, he tosses them a piece of meat] Hopefully the war won't go on that long though.