Add a helper column to convert the age into an age group, then use a VLOOKUP
formula, withOUT exact match to class each age into a group. Use that column
in your SUMPRODUCT formula
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"Tina" wrote:

I really hope someone can help as I am a novice at anything other than the
simplest Excel formula!

I want to calculate the age of customers per month in clusters for ages -
for example in March 08 I want to know how many were 18-24, how many were
25-40 etc etc. I have been using sumproduct for loads of other calculations
as follows

=SUMPRODUCT(--(MONTH('2008'!$L$2:$L$2000)=3))

but I dont know how to link on the additional query for age groups.

Thanks

Tina