Okla. Stat. tit. 40, § 40-79: Age and schooling certificates - Proof of age

The age and schooling certificate shall be approved by the

principal, headmaster, or equivalent administrative officer of the

school which the child attends or should be attending or by one of

the child's parents if the child is being schooled at home, who

shall, for the purpose of this article, be empowered to administer

an oath. The principal, headmaster, or equivalent administrative

officer of the school which the child attends or should be attending

or by one of the child's parents if the child is being schooled at

home, shall approve such certificate only upon the application in

person of the child desiring employment accompanied by its parents,

guardian or custodian, and after having received, examined and

approved documentary evidence of age, showing that the child is

fourteen (14) years of age, or over, which evidence shall consist of

one of the following named proofs of age, duly attested, and the

proof accepted shall be specified in the certificate issued to the

child; the proof specified in subdivision (a) shall be required

first, but if this is not available then one of the proofs specified

in the succeeding subdivisions shall be required and in the order

designated until the age of the child be established, as follows:

(a) A birth certificate or transcript thereof issued by a

registrar of vital statistics or other officer charged with the duty

of recording births which certificate or transcript thereof shall be

prima facie evidence of the age of the child.

(b) A certificate of baptism or transcript thereof, showing the

date of birth and place of baptism of the child.

(c) A passport showing the age of the child; or a certificate

of arrival in the United States, issued by the United States

immigration officer and showing the age of the child; or a life

insurance policy at least one (1) year old showing the age of the

child or other credible evidence as may be approved by the

Commissioner.

Every employment certificate shall be signed, in the presence of

the officer issuing the same by the child in whose name it is

issued.