Letâ€™s consider the following dataset (in **B4:C14**) with people’s**Â Names **and their **ID Numbers**. The first 6 digits in **ID Numbers** represent the date of birth in the format **yy-mm-dd**. Excel doesn’t offer any built-in functions to calculate age from a number. However, we can combine a few functions to convert the date of birth to age.

**Method 1 – Calculate the Age from the ID (Two Versions)**

**Case 1.1 – Calculate the Age from the ID with the MID Function**

__Steps:__

- Add a
**Date of Birth**column and insert this formula in the first cell:

`=MID(C5,5,2)&"/"&MID(C5,3,2)&"/"&MID(C5,1,2)`

Here, the **C5 **cell represents the *ID Number *(** text** argument), and the next two numbers represent the

**arguments respectively. The**

*start_num and num_chars***MID**function extracts the first 6 digits from the

**ID Number**text.

- Insert a
**Current Date**column and use the**TODAY**function, which returns the present date:

`=TODAY()`

- Calculate the Age in years by calculating the difference between the two dates and dividing by 365 days (copy the formula below). The
**INT**function rounds the Age to the nearest whole number.

`=INT((E5-D5)/365)`

**Case 1.2 – Using the DATE Function to Extract the Age from the IDÂ **

__Steps:__

- Add a
**Date of Birth**column and insert this formula in the first cell:

`=DATE(LEFT(C5,2),MID(C5,3,2),MID(C5,5,2))`

Here, the **C5 **cell represents the *ID Number *(** text** argument).

- Add a
**Current Date**column and apply the**TODAY**function which returns the present date:

`=TODAY()`

- Calculate the Age in years by calculating the difference between the two dates and dividing by 365 days. Use the following formula:

`=INT((E5-D5)/365)`

**Read More:** Metabolic Age Calculator in Excel

### Method 2 – Compute the Age from the ID Number Directly

**Case 2.1 – Calculate the Age Using DATEDIF and IF FunctionsÂ **

- Copy the following formula into the first result cell (D5), press Enter, and AutoFill for the other results.

`=DATEDIF(DATE(IF(LEFT(C5,2)>TEXT(TODAY(),"YY"),"19"&LEFT(C5,2),"20"&LEFT(C5,2)MID(C5,3,2),MID(C5,5,2)),TODAY(),"y")`

**Formula Breakdown**

- The
**MID**function obtains the first 6 numbers from the ID Number in the**C5**cell. - The
**IF**function checks whether the year is less than or greater than the current year. - The
**DATEDIF**function subtracts the birth year from the present year and returns the**Age**.

**Case 2.2 – Calculate the Age with DATEDIF and DATE FunctionsÂ **

Use this simplified formula:

`=DATEDIF(DATE(MID(C5,1,2),MID(C5,3,2),MID(C5,5,2)),TODAY(),"y")`

In this expression, the **C5 **cell represents the *ID Number *(** text** argument), while, the two following numbers refer to the

**arguments respectively.**

*start_num and num_chars***Formula Breakdown**

- Initially, the
**DATE**function takes in 3 arguments (*year**,*) which are provided by the**month**,**day****MID**function. - Finally, the
**DATEDIF**function returns the**Age**.

**Method 3 – Convert an ID Number to Age with Data Tools**

__Steps__

- Add a column (
**D5:D14**) titled**Date of Birth**and copy and paste all**ID Numbers**in that column. - Select all the cells in the column and click the
**Text to Columns**button in the Data ribbon.

- A
**Convert Text to Columns Wizard**appears. - Select
**Fixed width**since all ID Numbers have the same number of digits. - Press Next.

- Click just after the 6th digit from the left side, as depicted in the image below.
- Press Next.

- Select the
**Date**format from the drop-down and press**Finish**to close the dialog box.

- Add a column named
**Current Date (E5:E14)**and enter the**TODAY**function to get the present date:

- Make another column for
**Age (F5:F14)**and compute the difference between the two dates by copying the following function and auto-filling for other cells in the column.

`=INT((E5-D5)/365)`

**Read More: **How to Calculate Retirement Age in Excel

**Method 4 – Using VBA Code**

- Add a
**Date of Birth**column and insert this formula:

`=MID(C5,5,2)&"/"&MID(C5,3,2)&"/"&MID(C5,1,2)`

- Go to the
**Developer**tab and select**Visual Basic**.

**Insert**a**Module**where youâ€™ll paste the**VBA**code.

- Copy the code below and paste it into the window:

```
Public Function calculate_age(birth_date As Date, Optional result_index As Integer = 0) As Variant
today_day = Day(Date)
today_month = Month(Date)
today_year = Year(Date)
birth_date_day = Day(birth_date)
birth_date_month = Month(birth_date)
birth_date_year = Year(birth_date)
If birth_date_month < today_month Then
age = today_year - birth_date_year
ElseIf birth_date_month = today_month Then
If birth_date_day <= today_day Then
age = today_year - birth_date_year
Else
age = today_year - birth_date_year - 1
End If
Else
age = today_year - birth_date_year - 1
End If
Dim output_array(25) As Variant
output_array(0) = age
output_array(1) = Date
output_array(2) = today_day
output_array(3) = today_month
output_array(4) = today_year
output_array(5) = birth_date_day
output_array(6) = birth_date_month
output_array(7) = birth_date_year
calculate_age = output_array(result_index)
End Function
```

- Close the
**VBA**window and return to your worksheet. - Type an
**Equal**sign followed by the**calculate_age**function and enter a cell reference (**D5**) containing the date of birth to get the age.

**Download Practice Workbook**

## Related Articles

**<< Go Back to Calculate Age | Date-Time in Excel | Learn Excel**

HI. WHAT IF THE ID NUMBER IS STARTED WITH 00 OR 01, PERSO THAT BORN AFTER YEAR 2000?

Hello RAY,

Thank you for your question. The Exceldemy team has created an Excel file with the solution to your question. Please provide your email address here, we will send it to you in no time.

Otherwise, you can just follow the steps below.

Suppose we want to use the

MID Functionas shown inMethod 1. Now, we want to determine the age of a person whoseID Numberstarts with00(which refers to theYear 2000) but that person was born after theYear 2000.Step: 1

â€¢ Firstly, letâ€™s consider

Marywith theID Numberto be‘0005255800012.â€¢ As a note, Excel removes any leading zeros from numbers so we have inserted an apostrophe comma to store the

ID Numberas text.Step: 2

â€¢ Secondly, letâ€™s assume

Marywas born in theYear 2003.â€¢ Now, on the

Date of Birthcolumn insert the formula given below.`=MID(C14,5,2)&"/"&MID(C14,3,2)&"/"&"0"&MID(C14,1,2)+3`

â€¢ You should see the result as

25/05/03.Step: 3

â€¢ Next, AutoFill the

Current DateandAgecolumns.â€¢ The value of

Ageshould be19years.Similarly, we have also included a second example for

Julianwith theID Number‘0108295800012but he was born in theYear 2006.Please feel free to provide any further feedback.