JKR mistake in World Book Day chat?

[shrtbusryder2002]

No: HPFGUIDX 95085

--- In HPforGrownups at yahoogroups.com, "Haggridd" 
<jkusalavagemd at y...> wrote:
> I haven't seen this adddressed elsewhere.  JKR said that Charlie was 
> two years older than Percy.  Were that the case, in PS/SS, Charlie 
> would have been a seventh-year at Hogwarts and captain of the 
> Gryffindor Quidditch team, not Oliver Wood.  Percy was a fifth-year 
> prefect.  Is my arithmetic off? Does anyody else have any thoughts 
> on this?


I believe the math is right. My only thought is that Ron does say in 
Romania STUDYING dragons at one point. Perhaps he was an exchange 
student or on an internship during his seventh year?

Its probably just a flint or a miscalculation on JKs part tho.

Jason