There are no age requirements set by the medical university for admission. Philippines Embassy gives Student Visa only for students who are 18 years of age. If you are 17 years old, you can get Special Study Permit(SSP) which is valid for 6 months. After 6 months, if you have not crossed 18 years, you have option to renew SSP till you become eligible for Student Visa. Click to find more details on Philippines student visa.