Issues with Fake people born before 1970?
$ for ii in $( seq 20 ) ; do drush cvapi contact.anonymize id=75636 locale=fr_FR | grep birth_date ; done
[birth_date] => 1982-10-21
[birth_date] => 1970-07-30
[birth_date] => 1970-09-30
mt_rand(): max(-48224137) is smaller than min(0) DateTime.php:32 [warning]
[birth_date] => 1973-03-14