i heavily agree with you. Disney has a shitty track record but this show (its style, effects, characters, actors) has renewed my hope. it also helps that Kaia is probably one of the best characters (design, taste, ideals) that i have seen in animated tv in some time.
Judging by her dialogue, she may be in her late 20's or 30's. She referred to Chuck "Easy son". A flashback may have shown what she looked like prior (and explaining it would take years of exposure in order to mutate)