Mail Merge Date Calculation Field

I have a mail merge in word.
I want to calculate based on a date field (start_date) for how long  we had doing business with certain client bast on the year. so start_date=  06/05/2001  2007-2001
" We value your loyalty over the past 6 years.
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Date arithmetic is very difficult in Word fields. It is much easier to create a separate field in the datasource.

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It's been three months since the question and the first comment, so I guess we can take it that the advice was taken.

that link points to a VB(A) method, where date arithmetic is easy. Do you have a way of using it in mail merge?
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