Harry's hair is always longish and unruly- it is one of the early signs of his magical background: no matter how many times his Aunt and Uncle would shave his head, it would grow back by the next day. As far as the others, I think they're going for a contemporary feel. ( Believe it or not, the boys are actually quite fashionable). Still, they fit their characters descriptions remarkably well.
Btw, at the time of filming this movie, Daniel Radcliffe was only 15, just a year older than his character. I think the kids all look pretty darn close to their character's ages. Many of the characters, such as Fred, George, Cedric, etc, are several years older than Harry.
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