JoshuaMadoc said:
33 and already having streaks of silver on his hair? Does Rowling live her life being surrounded by men suffering from rapid aging?
Considering how Harry spent the majority of his life trying to be murdered by a psuedo-immortal being, and then had to hoist both the wizarding world and the human world onto his back in order to save them, I wouldn't be shocked if he's aged from the immense amount of stress he was under.