Ok, thats fine, the point has to do less with actual age and more to do with life experiance as a result of age. Where as the Asier are inclined to look down on humans somewhat simply because they have a far greater level of knowledge and experiance they can't do this with Drago.
So the Asier are going to have deal with Drago from a position of relative equallity. The point is further driven home by a measure of shared knowledge, magic, dragons, etc; thats not a point I'm going to stress though.
As a note Drago stopped counting at 1,000.