What make a "Qualified Wizard"?

[Juli]

No: HPFGUIDX 118104


--- Vivamus : 
> I'm trying to recall if there is anything in canon 
> about what makes a "qualified wizard".  The only
> thing I can think of (other than age) is the OWLs.  
> If that's so, that means Harry would no longer be 
> under the underage decree, wouldn't it?


Actually after the OWLs kids aren't 'of age', legal
age in the WW to do magic outside Hogwarts is 17, and
since most of them take their OWLs at 15 or 16, they
still have some time before becoming of age.

Juli