In the United States, the FAA has strict age requirements for Air Traffic Controllers (ATCs) to ensure peak cognitive and physical performance. You must be no older than 30 at the time the job application window closes (meaning you must be hired before your 31st birthday). There is also a mandatory retirement age of 56 for those working in "active" control positions, though some may move into administrative or training roles after this. These limits are in place because the high-stress, fast-paced nature of the work requires intense focus and quick reaction times, which data suggests can decline with age. Different countries have varying rules; for example, the Airports Authority of India (AAI) typically sets a maximum age of 27 for Junior Executive ATC roles, with some relaxations for specific protected categories.