Finding someone’s age from their date of birth


Using Excel and need to find someone’s age from their date of birth? There is a function not readily documented by Microsoft, called DATEDIF, which will do just that.

Say the person’s date of birth is in cell B2,

then the syntax required is


TODAY() enters the current date, so that means that the age will automatically update as time goes by.

“y” tells the function that we want the answer in years.

If we want to find how many months since an event, we could use “m” as the final argument.

To learn more about Excel functions, you may like to attend one of our training courses – see for further details for London UK.

For Excel training in Sydney, Australia, please visit

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About jdonbavand

I am a trainer of Microsoft Office, Microsoft Project and Crystal Reports. I have called my blog "If Only I'd Known That...." because I hear it so many times in training sessions. In fact, if only I had a £100 (or 150 Aussie dollars)for every time someone says "If only I'd known that." ....
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