How to Calculate Age from Date of Birth in Excel | DATEDIF Formula | Excel Tutoring 2026
🎂 Stop counting years manually! Learn how to calculate a person's exact age from their Date of Birth (DOB) instantly using Microsoft Excel.
In this tutorial, we reveal one of Excel's best "hidden" formulas: the DATEDIF function. When you combine this with the TODAY() function, you can create a dynamic age calculator that automatically updates every single day!
This is a must-know trick for HR professionals managing employee records, teachers organizing student data, or anyone working with birthdays in a spreadsheet.
📘 *FORMULA SYNTAX EXPLAINED:*
=DATEDIF(start_date, end_date, "unit")
*Example used in this video:*
=DATEDIF(A2, TODAY(), "Y")
*A2 (start_date):* The cell containing the Date of Birth.
*TODAY() (end_date):* A dynamic formula that always pulls today's current date.
*"Y" (unit):* Tells Excel to return the difference in complete **Years**.
💡 *PRO TIP:* Want to know the exact age in Months or Days instead? Just change the "Y" in the formula to "M" (for months) or "D" (for days)!
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⏱️ *Calculate Age in Excel*
0:00 - Intro: Date of Birth Data
0:02 - Typing the Hidden =DATEDIF Formula
0:05 - Selecting the DOB Cell
0:07 - Adding the TODAY() Function
0:09 - Using "Y" to Calculate Complete Years
0:12 - Final Age Result
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