An interesting facet is that, in a literal sense, all of the senet beasts are the same age. Like the khert itself, time didn't exist during the age of senet beasts. Water women were created at the same "time" as a walking root. Once humanity was decided to be created, time was started on the continent, which allowed for mortals to function. That itself killed innumerable senet beasts, who weren't mentally equipped to handle linear causality.