[Spoilers Main] How much do the younger character ages bug you? Do you think it's affecting the ending?

Outside of Jon and Daenerys, all of the younger characters are basically under 15, with Jon barely being 17 or so. Assuming the book continues along without a major time skip or events slowing way down in terms of pacing, do you think the youth of the characters is making it harder to find/write a satisfying ending? How believable is it to you that any of these young characters are able to hold and wield any sort of power? Political, martial, magical, etc.