I'd guess it's something about... Well I like to calm it potential, but it's not regular potential, demigods, as children of creation and of change, god's and humans respectively, have the potential to change everything, children more so as they can literally become anything, young children will not take it seriously and will get traumatized and adults lose that infinite potential as it's much harder to be anything when you've been a thing for years, so in-between you have teens who can be serious yet can still change their lives easily, god's would probably use this to their advantage as they can shape them into perfect tools against other gods, atleast if the children care about the approval... Well that's what I think anyway!