Well to become flight attendant one must have passed Class-12 examinations or its equivalent education and your minimum age must be at least 18 years of age.

Duration of Courses to become flight attendant

Duration of Class XII -- 1 year and
Duration of Graduation is 3-4 years

Other Criteria to become flight attendant

-Proficiency in English and Hindi are a must for a domestic airline
- Knowledge of a common foreign language is an added advantage for an international airline.
-Anyone suffering from night blindness or colour blindness will not be eligible.
- You also needs to be at least 157 cm tall (in case of women) 165 cm tall (in case of men)
- Your body weight must be in proportion to your height
- You must know how to swim.