Calculate A Person's Age

Public Function Age(dteDOB As Date, Optional SpecDate As Variant) As Integer
    Dim dteBase As Date, intCurrent As Date, intEstAge As Integer
    If IsMissing(SpecDate) Then
        dteBase = Date
    Else
        dteBase = SpecDate
    End If
    intEstAge = DateDiff("yyyy", dteDOB, dteBase)
    intCurrent = DateSerial(Year(dteBase), Month(dteDOB), Day(dteDOB))
    Age = intEstAge + (dteBase < intCurrent)
End Function

'*************************************************************
' FUNCTION NAME: Age()
'
' PURPOSE:
'    Calculates age in years from a specified date to today's date.
'
' INPUT PARAMETERS:
'    StartDate: The beginning date (for example, a birth date).
'
' RETURN
'    Age in years.
'
'*************************************************************
Function Age(varBirthDate As Variant) As Integer
   Dim varAge As Variant


   If IsNull(varBirthDate) Then Age = 0: Exit Function

   varAge = DateDiff("yyyy", varBirthDate, Now)
   If Now < DateSerial(Year(Now), Month(varBirthDate), Day(varBirthDate) _
                        ) Then
      varAge = varAge - 1
   End If
   Age = CInt(varAge)
End Function

'*************************************************************
' FUNCTION NAME: AgeMonths()
'
' PURPOSE:
'  Compliments the Age() function by calculating the number of months
'  that have expired since the last month supplied by the specified date.
'  If the specified date is a birthday, the function returns the number of
'    months since the last birthday.
'
' INPUT PARAMETERS:
'    StartDate: The beginning date (for example, a birthday).
'
' RETURN
'    Months since the last birthday.
'*************************************************************
Function AgeMonths(ByVal StartDate As String) As Integer
Dim tAge As Double
   If IsNull(StartDate) Then AgeMonths = 0: Exit Function
   tAge = (DateDiff("m", StartDate, Now))
   If (DatePart("d", StartDate) > DatePart("d", Now)) Then
      tAge = tAge - 1
   End If
   If tAge < 0 Then
      tAge = tAge + 1
   End If

   AgeMonths = CInt(tAge Mod 12)

End Function