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How to calculate age before 1/1/1900 in Excel?

In Excel, the date before 1/1/1900 cannot be entered and calculated correctly. If you want to calculate the age of a person who was born and died before 1/1/1900, that would not get the correct calculation in Excel generally. But here in this article, a trick can help you to calculate the age before 1/1/1900 in Excel.

Calculate age before 1/1/1900 with VBA

Calculate age by birthday with Kutools for Excel good idea3

arrow blue right bubble Calculate age before 1/1/1900 with VBA

Here is a VBA code can help you to quickly calculate the age before 1/1/1900.

1. Select a blank cell and enter the birthday of the person, and then select another cell to enter the date of today, or the date of person die as you need. See screenshot:
doc calculate age before 1900 1

2. Then press Alt + F11 keys to enable Microsoft Visual Basic for Applications window.

3. Click Insert > Module, paste below VBA to the new Module window.

VBA: Calculate age before 1/1/1900

Public Function AgeFunc(SDate As Variant, EDate As Variant) As Long
    Dim xSMonth As Integer
    Dim xSDay As Integer
    Dim xSYear As Integer
    Dim xEMonth As Integer
    Dim xEDay As Integer
    Dim xEYear As Integer
    Dim xAge As Integer
    If Not GetDate(SDate, xSYear, xSMonth, xSDay) Then
        AgeFunc = "Invalid Date"
        Exit Function
    End If
    If Not GetDate(EDate, xEYear, xEMonth, xEDay) Then
        AgeFunc = "Invalid Date"
        Exit Function
    End If
    xAge = xEYear - xSYear
    If xSMonth > xEMonth Then
        xAge = xAge - 1
    ElseIf xSMonth = xEMonth Then
        If xSDay > xEDay Then xAge = xAge - 1
    End If
    If xAge < 0 Then
        AgeFunc = "Invalid Date"
        AgeFunc = xAge
    End If
End Function

Private Function GetDate(ByVal DateStr As String, Y As Integer, M As Integer, D As Integer) As Boolean
    Dim I As Long
    Dim K As Long
    Y = 0
    M = 0
    D = 0
    GetDate = True
    On Error Resume Next
    I = InStr(1, DateStr, "/")
    M = CLng(Left(DateStr, I - 1))
    D = CLng(Mid(DateStr, I + 1, InStr(I + 1, DateStr, "/") - I - 1))
    Y = CLng(Right(DateStr, Len(DateStr) - InStrRev(DateStr, "/")))
    If M < 1 Or M > 12 Or D < 1 Or D > 31 Or Y < 1 Then
        GetDate = False
    End If
End Function

4. Select a blank cell, here is C2, and enter this formula =AgeFunc(A2,B2) (A2 is the birthday, and the B2 is the end date), and press Enter key to get the age, and drag autofill handle to over the cells you need. See screenshot:
doc calculate age before 1900 2

Note: This VBA can only calculate ages with dates in the format of mm/dd/yyyy, such as 6/23/1845.

arrow blue right bubble Calculate age by birthday with Kutools for Excel

If the birthday dates are normally after 1/1/1900, you can apply Kutools for Excel’s Date & Time helper utility, which can quickly calculate the age by the given birthdays.

Kutools for Excel, with more than 300 handy functions, makes your jobs more easier. 

After free installing Kutools for Excel, please do as below:

1. Select a blank cell you want to output the age, and click Kutools > Formula Helper > Date & Time helper. See screenshot:
doc calculate age before 1900 3

2. Then in the Date & Time helper dialog, check Age option, select the birthday you want to calculate age based on to the Date of Birth textbox, default, the cell will be selected as absolute reference, you can change it to relatiev reference, then check Today option and choose one result type you want to show in the drop-down list of Output result type. See screenshot:
doc calculate age before 1900 4

3. Click Ok to apply this formula, and now you can see the age has been shown. And if you need, you can drag the autofill handle to over the cells needed this formula. See screenshot:
doc calculate age before 1900 5

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don't work excel say "nombre Ambiguo"
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