You're never too old for Halloween. Trick-or-Treating? Maybe. But dressing up is always fun.

My hair is poofy as well. Thick, wavy, and poofy. XD
But if I shower and spend a good hour or so on it, I can usually get it pretty flat. It's still somewhat poofy, but with my face shape, it looks better than if it were flat and thin.
Anyway... I may consider Haruhi now, too. It all depends on how difficult the costume would be, and how much it would cost to make one. Because ordering one is out of the question.