To claim your senior citizen discount for movies in the Philippines, you'll need to present a valid senior citizen ID at the ticket counter. This ID serves as proof of your age and entitles you to a 20% discount on tickets, as mandated by the Expanded Senior Citizens Act (RA 9994). It's best to check with the specific cinema for any additional requirements they may have. Also, be aware that some cinemas may have certain restrictions on peak hours or special screenings, so it's a good idea to confirm before your visit.