So is the text as suggested sufficient?
Should we replace "elderly" with "old or older"? Otherwise, it looks good.
Sure, the parenthetical will be fine. Are we all set with the description in that case?
Subtype, I guess. It's a bit hard picking a single elemental/energy subtype for it, since its two breath weapons are quite distinct. Fire would be once possibility, but Water Breathing is a little weird in that case. I kind of like Chaotic for it, especially in opposition to the gold dragon, but dragons don't generally get alignment subtypes. I guess I'd probably go either with Fire or else drop the subtype. There's precedent for that, IIRC. What do you think?