Yes there is an age requirement for admission to the Aircraft Maintenance Engineering (AME) B1.1 Stream. According to the official information on the course page: candidates should be between 16 and 28 years of age at the time of admission.
If you are under 16 years old, you generally cannot join the AME B1.1 course.
If you are older than 28 years, most colleges/institutes may not accept your application for B1.1 admission.
Along with age, you must also meet the educational criteria typically 12th grade with PCM (Physics Chemistry, Mathematics) or a relevant diploma plus any other requirements like minimum marks.
For other variants of AME courses (or depending on institute), eligibility criteria may sometimes vary slightly. Some sources mention the age criterion as "between 16-28 years at the time of admission."