This Excel tutorial serves as the ultimate guide to mastering age calculation in Excel. Whether you’re working with people, objects, business assets, commercial projects, or insurance records, learning how to calculate age in Excel is essential.

When calculating the age of individuals or items, the key is bridging the gap between two dates. For humans, this often starts with their date of birth (DOB). Another approach is projecting the aging of individuals or objects to a future timeframe.

Yet, such calculations involve navigating dates, especially the complexities tied to varying days in months. This is where Excel’s age calculation techniques come to your aid. Moreover, by learning the methods outlined in this article, you’ll be able to compute the age of thousands of subjects within seconds.

Reasons to Learn How to Calculate Age in Excel

Here’s why you must master the skills of various types of age calculations in Excel:

1. Quickly calculate ages for individuals, objects, or data sets without manual calculations.
2. Reduce errors by leveraging Excel’s date functions for precise age calculations.
3. It applies to diverse scenarios, including people, projects, assets, and more.
4. Ensure uniform age calculations regardless of varying month lengths.
5. Project pages to specific future dates for planning and analysis.
6. You can immediately subject the age data to further data analysis or visualization.
7. Integrate age calculations into larger data processing workflows.
8. Develop problem-solving skills by tackling complex date-related challenges.

How to Calculate Age From Birth Date in Excel

At the time of writing, the latest Excel desktop app is the Excel for Microsoft 365 and there’s no dedicated commands block for age calculation on the Excel Formulas tab. Neither, there are any direct formulas to calculate age in Excel.

However, you can make use of various other functions in Excel that calculate dates. So, when you’re following the manual method of solving for age or aging in Excel, you must remember some formulas that can help.

The easiest combination of an Excel formula and the mathematical operator division to calculate age is TODAY() and dividing the time to date by 365 to get a rough age of a person or object. However, you must also need a date of birth for human beings and starting date for objects or projects.

Here’s how you can calculate age when the DOB or start date is given:

1. In the destination cell, enter the following formula:

=INT((TODAY()-B2)/365)

2. In the above formula, B2 is the source data for DOB or start date.
3. Hit Enter, and you get the age value in years in an integer.

Another Excel function you can use to calculate the age of people or things from a start date and end date is the YEARFRAC formula.

The formula enables you to input an argument so Excel understands the day count basis you want to use. For example, you can use the numbers 0 to 4 to indicate US (NASD) 30/360, Actual/Actual, Actual/360, Actual/365, and European 30/360 respectively.

Here’s how you can use this function to calculate project length between two dates or the age of a person between the DOB and a specific date:

1. Highlight the destination cell and enter the following formula:

=ROUNDDOWN(YEARFRAC(B2,C2,1),0)

2. Hit Enter to get a rounded age in years.

In the above formula, B2 is for the start date or DOB and C2 represents the specific date up to which you want to calculate age or project length. So, customize the formula according to your own worksheet.

The methods mentioned so far only calculate the age in complete years. What if you need the age in years, months, and days? In this situation, you use a nested formula of DATEDIF and IF with commas to separate each value and define the values as years, months, and dates.

The IF function ensures you don’t get 0 values like 0 years, 0 months, 0 days, etc. Thus, the resulting values read well and the dataset stays compact.

Find below the syntax you can use and the instructions for formula customizations:

1. Assuming you got DOB values in column B and As of Date values in column C.
2. Highlight D2 and enter the following formula:

=IF(DATEDIF(B2, C2, "y") > 0, DATEDIF(B2, C2, "y") & " years ", "") &
IF(DATEDIF(B2, C2, "ym") > 0, DATEDIF(B2, C2, "ym") & " months ", "") &
IF(DATEDIF(B2, C2, "md") > 0, DATEDIF(B2, C2, "md") & " days", "")

3. Hit Enter to get the age values in D2 in this format: X years X months X days.

Here’s how you can customize the above formula:

• Replace B2 with the exact cell reference on your worksheet for the DOB of the person or the start date of the project.
• Also, replace C2 with the exact cell address in your dataset for the specific date till when you want to calculate age.
• If you don’t want days in the age calculation, simply delete everything after the code element DATEDIF(B2, C2, "ym") & " months ", "").

How to Calculate Aging in Excel

Using Excel, you can easily forecast the date when a person will attain N years of age. Suppose, your friend’s DOB is 15-May-95. Now, you’d like to know when will she turn 75. Use the following formula and follow along with the steps to practice:

1. Suppose, you got DOB in column B and As of Year in column C.
2. Select D2 and enter the following formula into the cell:

=TEXT(DATE(YEAR(B2)+C2,MONTH(B2),DAY(B2)),"mm-dd-yyyy")

3. Hit Enter to get the date when your friend will turn 75.

In the above formula, B2 represents the start date or DOB and C2 represents the age of a person or the span of a project in years.

Calculate Age in Excel Using Excel VBA

Suppose, you don’t want to perform all these clicks or remember functions to calculate age in Excel. In that scenario, you can use Excel VBA to write a script and automate the whole process.

Don’t know how to write an Excel VBA script to calculate age in Excel? No issues! Find below a handy script you can use right away. For your assistance, I’ve also mentioned the steps you can follow:

1. Press Alt + F11 to call the Excel VBA Editor.
2. Click the Insert menu button on the top toolbar.
3. On the context menu that opens, click Module.
4. In the blank module, copy and paste the following Excel VBA script:

Sub CalculateAge()
    Dim ws As Worksheet
    Dim dobRange As Range
    Dim tillDateRange As Range
    Dim resultRange As Range
    Dim dobCell As Range
    Dim tillDateCell As Range
    Dim ageYears As Long
    Dim ageMonths As Long
    Dim ageDays As Long

    Set ws = ThisWorkbook.Sheets("Sheet5")
    Set dobRange = ws.Range("B2:B6")
    Set tillDateRange = ws.Range("C2:C6")
    Set resultRange = ws.Range("D2:D6")

    For Each dobCell In dobRange
        Set tillDateCell = tillDateRange.Cells(dobCell.Row - dobRange.Row + 1)
        ageYears = DateDiff("yyyy", dobCell.Value, tillDateCell.Value)
        ageMonths = DateDiff("m", dobCell.Value, tillDateCell.Value) Mod 12
        ageDays = DateDiff("d", DateSerial(Year(tillDateCell.Value), Month(tillDateCell.Value), 1), tillDateCell.Value)
        resultRange.Cells(dobCell.Row - dobRange.Row + 1).Value = _
            IIf(ageYears > 0, ageYears & " years ", "") & _
            IIf(ageMonths > 0, ageMonths & " months ", "") & _
            IIf(ageDays > 0, ageDays & " days", "")
    Next dobCell
End Sub

5. Click the Save button to save the script as a macro-free workbook.
6. Close the Excel VBA Editor.

So far, you’ve created a VBA macro. Now, learn below how to execute the script:

1. Press Alt + F8 keys to open the Macro dialog box.
2. Choose the CalculateAge macro.
3. Hit Run to automatically calculate the age in Excel.

Find below the instructions to customize the VBA script:

• Replace Sheet5 with the exact worksheet name on which you’re working.
• If your input DOB data is in any other cell range than B2:B6, change this reference in the code as well.
• C2:C6 cell reference represents the source data for till-date or as-of-date values. You also need to customize this cell reference.
• D2:D6 cell range represents the destination of the calculated results. Change it to another cell reference according to the input data size.

Calculate Age in Excel Using Office Scripts

Another advanced automation method in Excel is Office Scripts. Like Excel VBA, this feature allows you to write scripts in TypeScripts language to instruct Excel to perform data analysis automatically. An advantage of this feature is it works in both Excel for Microsoft 365 desktop and Excel for the web app.

Find below an Office Scripts code to calculate age in years, months, and days from date of birth and as of date:

1. Click the Automate tab on your Excel desktop or web app.
2. Choose the New Script option from the Scripting Tools block.
3. Copy and paste the following script inside the Code Editor:

function main(workbook: ExcelScript.Workbook) {
	let selectedSheet = workbook.getActiveWorksheet();
	// Set range D2 on selectedSheet
	selectedSheet.getRange("D2").setFormulaLocal("=IF(DATEDIF(B2,C2,\"y\")>0, DATEDIF(B2,C2,\"y\") & \"years\",\" \") & IF(DATEDIF(B2,C2,\"ym\")>0, DATEDIF(B2,C2,\"ym\") &\"months\",\" \") & IF(DATEDIF(B2,C2,\"md\")>0, DATEDIF(B2,C2,\"md\")& \"days\",\" \")");
	// Auto fill range
	selectedSheet.getRange("D2").autoFill("D2:D6", ExcelScript.AutoFillType.fillDefault);
}

4. Click the Save script button to save it for future use.
5. Hit the Run button to calculate the age values.
6. Excel will populate the results in column D.

Find below the quick tips to customize the above script to fit your Excel worksheet and its datasets:

• Replace D2 with the cell address where you want the first calculation to happen.
• You’ll also need to change the occurrences of cell references B2 and C2 if DOB and As of Date values aren’t located in these columns. Refer to the above image for clarification.
• The above script uses the Auto Fill feature to copy and paste the DATEDIF nested formula into other cells down column D, from D2:D6. If, you need to increase the rows, then change this range accordingly, like D2:D100.

📝 Note: The availability of Office Scripts depends on the Microsoft 365 subscription you or your company is using. If your subscription is Business Standard or better, you’ll find the feature in Excel on the web. For the Excel desktop app, you must download the Excel for Microsoft 365 app from the Microsoft 365 Home portal.

Conclusions

This post has explored three different Excel formulas to calculate age in Excel from date of birth or a start date, when it’s a project or business asset.

Also, you explored two different automation methods, Excel VBA and Office Script, to automate the task in Excel.

Follow along with the steps using your own dataset. Don’t forget to comment below to share your thoughts, suggestions, or experience while trying out the above methods.