OOP: Fred and George - mistake?

[CareALotsClouds at aol.com]

No: HPFGUIDX 63030

I don't know if I have got this right, but how comes it seems that before the 
school term has started that they are 'of age' meaning '18' but in the book 
4, they are not yet 17 by the time they want to put their names in the goblet?!
Did I miss something?
Loadsa love
Nic x


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