Alastair:
Why not try:
v1AgeNext = ( (INT( (.#Date - Birth1day) / 365 )) )

If Birth1day is null, the result should be null. That is what I get from a set var 
command.

Jim Blackburn
Kodiak

Alastair Burr wrote:
> 
> 
> v1AgeNext = (ifnull(Birth1day, 0, ( (INT( (.#Date - Birth1day) / 365 )) +
> )  ))
> 
> 
> Regards, Alastair.
> 
> A D B Burr,
> St. Albans, UK

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