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Public Function AlterBerechnen(dateGebdatum As Date, Optional dateDatum As Variant) As Integer
    If IsMissing(dateDatum) Then dateDatum = Date
    AlterBerechnen = Year(dateDatum) - Year(dateGebdatum)
    If DateSerial(Year(dateDatum), _
        Month(dateGebdatum), Day(dateGebdatum)) > dateDatum Then
        AlterBerechnen = AlterBerechnen - 1
    End If
End Function

Dim x As Integer
x = AlterBerechnen(#07.01.1963#,#01.04.2004#)