Quote Originally Posted by PoeticallyPsyco View Post
It can't gain levels, no, but there's nothing stopping it from going up an age category or 5. Well, nothing aside from some dragon parents who will probably be very upset at the prospect (they could always just break the curse, I guess, but it's probably not very healthy for the wyrmling's developmental psychology).
Quote Originally Posted by Kalkra View Post
It depends on a few things. First of all, suppose the Wyrmling gets hit with an Ennervate, and loses some of its RHD. Now suppose you hit it with a Greater Restoration. Would you say that it's ineffective, because it would cause the Wyrmling to gain levels?

Another thing. Would you say that losing RHD causes a dragon to move back age categories? If so, no dragon should ever die of old age. If not, you could age your Wyrmling and give it the powers of its new age adjusted for the lack of RHD. No levels gained.
You are both right of course. By RAW dragons advance thru age categories not "levels". RAI? I feel that it's yet another example of poor editing by WotC and that it was entended to remain a wyrmling.