Enforcement Rules for Senior Citizens (Old-ages) Welfare Act Article 6

Senior citizens (Old-ages) are entitled to get preferred treatments as stipulated in Article 25 of This Act with the presentation of ID or documents issued by government to prove seniority.
中文原文 老人福利法施行細則第6條
老人憑國民身分證或政府核發足以證明老人身分之證件,享受本法第二十五條規定之優待。

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