It was definitely Colin Creevey, from what I could tell. I can't remember the last time we saw him in the movies (I know he appeared at least once after Chamber of Secrets), so he's a bit older than when we last saw him.
I've always kinda prided myself on not crying at movies. But once the stuff with Nagini and Snape started, I was gone. I cried pretty much all through the Snape stuff and a while afterward because of Fred and Lupin and the massively under-shown Tonks. Oh, gosh.... Fred. *sniffle* And then I started tearing up a while after that because I realized it was all going to be over soon and what a journey it had been. It was rough.
I'm still waiting for my Hogwarts letter. It's ten years too late, but I'd gladly accept it if it were to show up sometime.
Being 11 and not getting my letter was kinda rough. And I knew it was fiction. But I wanted it to be real.
(By the way, I was 8 when the first book came out and 17 when the last one came out. I, too, feel like I'm in the perfect age group.