I agree with you Sydey, that biographies should be
accurate,
but taking information straight from the subject constitutes
original research and since we can't see their identification
papers it's not verifiable.
How do you suppose we verify the correctness of a given
birthdate if there's no newspapers or books stating the date
the subject says is correct.
It occurs to me that in academia, one occasionally sees "personal
correspondance" or "publication forthcoming" cited. Is there something
wrong with stating "The New York times gives Jim Smith's birthday as 24
May 1964, although Jim has stated that it's 24 May 1965[1]" where [1] is
Personal email to Wikimedia Foundation, 5 Nov 2005. It's verifiable in
the sense that you could always email Wikimedia and ask them if that's
true.
Steve