I couldn't find my book

, so I googled it and found something on wikipedia. This isn't solid fact, but I think it's safe enough
Albus is 11 (but we already know that)
James is at least 13 (because he knows about the theastrals, and they don't take the carriages first year)
Quote:
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Although it is possible that he is anything from 13 to 17 years of age at the end of the book, his attitudes suggest that he is not much older than his siblings.
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So I'd go with 13
Lily is 10 (I'm not quite sure of this one, but I'm pretty sure)
Rose is 11.
Hugo is younger, about Lily's age, so I would go with 10
EDIT: oops I didn't see someone already answered it. Yeah, I would go with A_Capella's