To apply for senior citizen benefits in the Philippines, you will need to visit your local Office of Senior Citizens Affairs (OSCA) or the nearest Department of Social Welfare and Development (DSWD) office. You'll need to provide valid identification, such as a senior citizen ID or birth certificate, to prove your age. It’s essential to fill out the application form provided by the office. For more specific guidance on eligibility and documents, you might want to check the official DSWD website or consult a local licensed professional.