An age certificate shall be issued, upon request of the employer or the worker, for a person sixteen years of age or over. It shall be issued by the person authorized to issue employment certificates under the provisions of this chapter upon presentation of the same evidence of age as required for an employment certificate. The age certificate shall show the person’s name and address, his date of birth and signature, the signature of the person issuing the certificate and the evidence accepted as proof of age. An employment or age certificate duly issued shall be conclusive evidence of the age of the person for whom issued in any proceeding involving the employment of the person under any of the labor laws of this Commonwealth as to any act occurring subsequent to its issuance and prior to its revocation.