McGonnagal-quidditch 1971?

[Catlady (Rita Prince Winston)]

--- In HPFGU-Movie at y..., dpitzel at m... wrote:
> 
> 
> I'm not sure if this has been mentioned before, but did anyone 
> notice that McGonnagal had a quidditch trophy which was dated 1971?

I saw the name McGonagall but not the initials or date. Others have 
said M. G. McGonagall 1971. JKR said in an interview that McGonagall 
is 'a spritely 70' and I think it was the same interview that she 
said Snape was 35 or 36 -- Snape was in school at the same time as 
the Marauders, therefore McGonagall is old enough to be James' 
grandmother not classmate. I hope the plaque is a different 
McGonagall.