Seniors can register for PhilHealth coverage by visiting the nearest PhilHealth office or through their website. They will need to provide valid identification, proof of age, and any other required documentation. It's advisable to check the official PhilHealth website for specific requirements and forms, as these can vary. For a smooth registration process, seniors may also consider asking for assistance from family members or local health care providers. Always ensure your information is up to date to avoid any issues with claims.