From a list of dates of birth I need to show what school year they are in
today, but have it so it is always correct in the future too.

I can caculate their current school year using a vlookup table of dates of
birth between Sept and August and the relevent school year, but come
September 2009 this will be wrong.

i.e. if born 30th January 1996 today you will be in school year 8.
If I check the spreadsheet in January 2010 I need it to be telling me you
are now in year 9.

School year runs from 1st September to 31st August.

Any help much appreciated!