Invalid parameter 1 specified for datediff.

WHERE
            [pi].IndexID > @PageLowerBound AND
            [pi].IndexID < @PageUpperBound

And Country = @Country and
tbl_Profile.Gender = @Gender
and (DateDiff('yyyy', tbl_profile.BirthDate,getdate()) >= @Age1)
and (DateDiff('yyyy',tbl_profile.BirthDate,getdate()) <= @Age2)

      ORDER BY
            IndexID
      
      SET ROWCOUNT 0

      
      
END

Age1 and Age2 are integers