This feature can only be modified in Professional and Enterprise Editions.
With the AnyFind Date of Birth search preferences you can specify when Identity Finder will find numeric dates of birth. There are two options to help tailor your search and improve accuracy.
Match all dates in files with a DoB keyword: When Identity Finder encounters a keyword such as "birthdate" in a file, the actual date must logically be near that keyword. However for lists of dates as you might see in an Excel file, you might want every single occurrence of a date found. Select the radio button of your preference.
Search for dates of birth within a specified range: Identity Finder will find numeric dates of birth between the Start and End dates you provide.

To view or change these settings, click the Settings button on the Tools and Options ribbon.