Pat,
Thank you very much! This:
Age: IIF(IsDate([Died]) = True, (DateDiff("d",[DOB],Died))\365, (DateDiff("d",[DOB],Date()))\365)
solved my problem :) it works perfectly! And sorry for not being specific.
Pr2-Eugin - it was on a query, yes, sorry for not specifying - though I've kept...