Dragons are a classic staple of medieval fantasy. Their inclusion in dwarf fortress and the difficulty in trying to capture a breeding pair is fantastic. I would hate for it to be easy, that way its an accomplishment to actually have a pair of even cave dragons. But once you do manage to obtain a breeding pair, you get a rather… lackluster reward. Because dragons grow extremely slowly. Taking two hundred years to reach the size of an elephant. Im of course not saying they should reach full size in 5 years. But a roc reaches full size in only 20 years while being a similar size AND capable of domestication. But dragons have a fire breath attack and are slightly larger. As such i propose that (both breeds of) dragons mature in 40 to 50 years (reaching elephant size in 8 to 10 respectively). I know the game is fully moddable, and i have changed it myself before. I just think that in the yet-to-be-released premium version, players might end up being disappointed discovering that a breeding pair of dragons is not nearly as valuable as it sounds. The only use that i currently know of is to let them breathe fire through fortifications, but you could always do that with a singular dragon. On the bright side, having your dwarves wearing dragonleather quivers DOES sound bad***.