To apply for an OSCA ID, start by visiting your local Office of Senior Citizens Affairs (OSCA). Bring along your valid ID, proof of residency, and a completed application form, which you can typically obtain at the OSCA office or download from their website. Once you submit your documents, the office will process your application, and you may receive your OSCA ID on the same day or within a few weeks. For the most accurate information, including any specific requirements for your area, it’s best to check with your local OSCA or visit their official website.