I don't see how it could work, unless with age the stones become less sensetive, and don't timeshift when struck. Either way, it doesn't work, it would only be a localised time shift. Furthermore, don't they go back in time, not forwards? That would mean it would have to have been originally used by Adult Link, sending him back to the beginning of Oot, as a child, and then leading up to when he first got it, but, having already had it, it's a time paradox. Possibly a time loop. And it still wouldn't put him back to being a child.