Official Document Formats Act Article 5

Application letters submitted by members of the public to government agencies shall be signed, sealed, and contain information on the applicant’s gender, age, occupation, and address.
中文原文 公文程式條例第5條
人民之申請函,應署名、蓋章,並註明性別、年齡、職業及住址。

English translation for reference only; the Chinese text prevails. Not legal advice.