Excel 2007 (with compatibility to 2003

Sub CalcAge()
Range("IssAgeP").Value = DateDiff("yyyy", Range("C7").Value,
Range("c5").Value)
End Sub

C7 = 8/4/1962
C5 = 2/4/2009

Expect to get 46, getting 47 - Is the problem with using Range().value?
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