ok this works well and is correct:
IIF((DateDiff("m",Date(),DateAdd("yyyy",( DateDiff("yyyy",#02-10-1974#,Date())+1),#02/10/1974#))) > 12, (DateDiff("m",Date(),DateAdd("yyyy",( DateDiff("yyyy",#02-10-1974#,Date())+1),#02/10/1974#))) - 12, DateDiff("m",Date(),DateAdd("yyyy",(...