Underage Wizardry

[Kate]

No: HPFGUIDX 130282

In OOP the Weasely twins were 17 and therefore no longer considered 
underage in the wizarding world.  I have a feeling this is also why 
they were able to quit school at the end of the book without their 
mother completely disowning them.  I'm sure that Molly wasn't happy 
about it but they were at no longer underage wizards so it was 
ultimately their choice.  

-Katie