There are lots of non traditional fil am med school aplicants out there. I am one of them. You can search this forum or just browse the numerous topics that have been posted to get more information about the application process.
To prepare myself for the NMATs I took bio, chem, physics, and anatomy and physiology as a post bac non-degree student at a local university. I had a limited science background since my undergrad degree is in Antrhopology and Historic Preservation. Since you had a pre med track during undergrad, I'm sure you'll be ok if you just pick up one of the numerous MCAT reviewer books. The NMAT is not as in depth as the MCAT. I might be able to scan the practice exams and post them later.
Dont feel like you are too old to apply. My 29 year old sister who is a 4th year med student in UERM has an american batchmate who is well into her late 30s maybe even hitting 40 this year. Don't mind the traditional pinoy students that start the program at the age of 20-21.
good luck!