I've often heard the term 'old soul,' without really knowing what it meant. But I think of Rodeo as an old soul. He has such a gentle demeanor and calmness about him (at least most of the time). And his piercing blue eyes make him seem far older than his years.
Bonny, on the other hand, is definitely a new soul. And I mean that in a positive way. She's full of boundless energy and enthusiasm, and everything in the world is new and exciting to her. For her, life seems all about possibilities.