Section 3218. Evidence of age

1. Evidence showing that the minor is of the
  required age shall be presented as follows:
    a.  A duly certified transcript of a birth certificate filed according
  to law, or duly certified transcript of a record of baptism, giving  the
  date of birth; or, if not available,
    b.  A  passport  showing  the  date  of birth of the minor; or, if not
  available,
    c. Other documentary evidence or other recorded evidence in  existence
  two years or more, and satisfactory to the certificating officer, except
  an affidavit of age.
    2.  Certificate of age.  A person over eighteen years of age may apply
  for a certificate of age to the superintendent of schools, the  district
  superintendent, or to the certificating officer. Upon such application a
  certificate  of  age,  containing  the  name, date of birth, address and
  signature of the applicant, shall be issued to him if he furnishes  such
  evidence  that  he  is over eighteen years of age as is required for the
  issuance of an employment certificate. Such a certificate of age  or  an
  employment  certificate  previously  issued  for  such  person  shall be
  conclusive evidence for an employer that the person has reached the  age
  certified to therein.