You can apply whenever you are ready. The basic requirement is you must finish secondary education or high school.
To become a trained airline pilot at Epic Flight Academy in New Smyrna Beach, Florida, USA you must:
1) Be at least 17 years of age
2) Speak English proficiently
3) International students must have a valid passport (Passport information: https://epicflightacademy.com/passports/) or two other forms of identification if you are from the USA
4) Completed high school or secondary education (Grades don’t matter, only that you completed school.)
To see if you qualify for this program, kindly complete this form: https://epicflightacademy.com/prequalification-enrollment/