To apply for an OSCA ID, you'll typically need to provide a valid government-issued ID, proof of age (like a birth certificate or passport), and proof of residency in the Philippines. Some local offices may also require additional documents, such as a recent photo or a filled-out application form. It's best to check with your local Office of Senior Citizens Affairs (OSCA) for any specific requirements they might have. Always ensure your documents are current and valid to avoid delays in the application process.