5 Aug. 2011
From what you posted earlier, I gather that you need to do modifications for a number of people.
PAF does allow you use a non-precise date using forms such as ABT 1990 (about 1990), AFT 1990 (after 1990), BEF 1990 (before 1990), or EST 1990 (estimated 1990).
It would probably be a bit of work for you to go back and add dates like that to your existing database, but keep it in mind for future entries.
Dave