DateDiff function will not work in ACCESS query

I want to get the age of a person and I tried using DateDiff("yyyy", DOB, Date()) and all I get is error that the function is not recognized.  I have done this before, but just do not know why it will not work now??  This is an ACCESS 2013 database and I am about ready to take the computer and throw it out the window.
Sandra SmithRetiredAsked:
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Najam UddinCommented:
try changing Date() to today() or Now
Sandra SmithRetiredAuthor Commented:
Sandra SmithRetiredAuthor Commented:
It is like it is not recognizing any functions as I get the same error when I try Date(), Now() or whatever.
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Dale FyeOwner, Developing Solutions LLCCommented:
DateDiff is not going to work for age.  For example,

DateDiff("yyyy", #12/31/14#, #1/1/15#) = 1

So you need something a little more distinct, try:

?DateDiff("yyyy", DOB, Date()) + (Format(Date(), "mmdd")  < (Format(DOB, "mmdd")))

This way, you determine the difference in the Year( ) portion of the two dates, and then check to see whether the current Date (mmdd) < the DOB (mmdd).
Dale FyeOwner, Developing Solutions LLCCommented:
can you post your SQL?

Just out of interest, what version of Office are you using?
Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:
Your syntax works on my machine (2013), so I would assume there's something else going on.

Check your references, make sure none are marked MISSING.

Close/reopen Access.

Reboot your machine.

Compile the database, and fix any errors.

Make sure your Windows and Office installations are fully up to date.
Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:

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Sandra SmithRetiredAuthor Commented:
Thanks, this will do.  There was no SQL, it was simply using the DateDiff function, which kept throwing an error.  It worked in the Immediate window and all references were there.  But this has solved my issue.
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