I think the Harry Potter cast looked good. It was just like the cast grew up along with the passage of time in the story.The entire Harry Potter cast after the third or fourth movie all got too old or at least looked it.
First pic of that lil montage hes like 'i want you i need you... hahahIn the original Spiderman films Tobey Maguire and all the other actors who were supposed to be high school graduates all looked like they were about 30. It's so funny looking back at it.
They tend not to do this so much anymore and in the new spider man films everyone at the school doesn't look out of place. And they don't hire actual kids for the roles either just some young looking actors.