MechaTarrasque
Hero
I think it also depends on how common dragons are in your world. The rarer they are the more likely something that would want to get its hooks into young and malleable dragons will take an interest in the party. Fiends are basically immortal unless something kills them, so it is a good investment to enslave a young dragon if you can keep it enslaved until (and when) it is an ancient dragon. Social groups (like say yuan ti or hobgoblins) might be willing to make the same assessment. And let's not get started on giants.....
I would find it hard for a party hanging around with a wyrmling to stay in its weight class, unless dragons are so common that it isn't worth the trouble. Of course, if dragons are that common, then issues about magic items, armor, etc. are probably resolved by basic economics.
I would find it hard for a party hanging around with a wyrmling to stay in its weight class, unless dragons are so common that it isn't worth the trouble. Of course, if dragons are that common, then issues about magic items, armor, etc. are probably resolved by basic economics.