Charlie Weasley's age

[scoutmom21113]

No: HPFGUIDX 76309

Okay, here is what I have:

FACTS:
1991 - HRH enter Hogwarts, age 11 (birth 1980).  Charlie Weasley has 
already graduated.
1991 - (SS p153) Gryffindor hasn't won the Quidditch Cup since 
Charlie left.
1993 - (POA p184)Gryffindor hasn't been in the running for Quidditch 
Cup for 8 years.  (1993-8=1985)

If Charlie graduated in 1985, then HRH started 6 years later.  So 
our timeline would be:
1967 - Charlie born
1978 - Charlie starts Hogwarts
1980 - HRH born
1985 - Charlie graduates (last time Gryffindor won Q-Cup)
1991 - HRH start Hogwarts

So that makes Charlie 13 years older that HRH, and Bill at least 14 
years older.  Please check my math (I'm sure someone ;) will.)  

Extrapoliations:
1966 - Bill born? (latest year)
1977 - Bill starts Hogwarts
1981 - Ginny born

Somewhere I remember Ginny saying she has wanted to go to Hogwarts 
since Bill got his letter?  But since Charlie was already in school 
before HRH were born, Bill would have been in school before Ginny 
was born.  Possible FLINT?  Who has anything else to add?

Ravenclaw Bookworm (who is amazed the books ever get completed if 
this is what goes into a *minor* detail...)