calculating age in years and months in Microsoft Access (2010)

Question

I have two fields (Date of Physical Exam and Date of Birth). I calculated the age in years((Date of Physical Exam- Date of Birth)/365.25). What I want to do is calculate a

Answer 1

While the DateDiff() function seems like the logical choice for calculating ages, it unfortunately does not calculate the number of full years or months that have elapsed between two dates. For example, say that a baby was born on December 31, 2014, and was examined exactly 48 hours later, on January 2, 2015. That is,

DateOfBirth = DateSerial(2014, 12, 31)
DateOfExam = DateSerial(2015, 1, 2)

If we simply used DateDiff() to calculate her "age" in years and months at the time of the exam we would get

?DateDiff("yyyy", DateOfBirth, DateOfExam)
 1 
?DateDiff("m", DateOfBirth, DateOfExam)
 1 

So, we would report that the baby is 1 year and 1 month old, when really she is just 2 days old.

Proper age calculations need to be more sophisticated than that. The following VBA function will calculate the "age" in years and months, returning a string like "2 years and 1 month":

Public Function AgeInYearsAndMonths(StartDate As Variant, EndDate As Variant) As Variant
    Dim Date1 As Date, Date2 As Date
    Dim mm1 As Integer, dd1 As Integer, mm2 As Integer, dd2 As Integer
    Dim ageYears As Integer, ageMonths As Integer, rtn As Variant
    rtn = Null
    If Not (IsNull(StartDate) Or IsNull(EndDate)) Then
        If StartDate <= EndDate Then
            Date1 = StartDate
            Date2 = EndDate
        Else
            Date1 = EndDate
            Date2 = StartDate
        End If
        mm1 = Month(Date1)
        dd1 = Day(Date1)
        mm2 = Month(Date2)
        dd2 = Day(Date2)
        ageYears = DateDiff("yyyy", Date1, Date2)
        If (mm1 > mm2) Or (mm1 = mm2 And dd1 > dd2) Then
            ageYears = ageYears - 1
        End If
        ageMonths = DateDiff("m", Date1, Date2) Mod 12
        If dd1 > dd2 Then
            If ageMonths = 0 Then
                ageMonths = 12
            End If
            ageMonths = ageMonths - 1
        End If
        If ageYears = 0 And ageMonths = 0 Then
            rtn = "less than 1 month"
        Else
            rtn = ageYears & " year" & IIf(ageYears = 1, "", "s") & " and " & ageMonths & " month" & IIf(ageMonths = 1, "", "s")
        End If
    End If
    AgeInYearsAndMonths = rtn
End Function