A traveller between 2 to 12 year old is classified as a child, and anyone above 12 years old is classified as an adult. If your child is 11 years old at the time of departure but turns 12 before the return journey, they could still travel on a child fare or may have to pay for an adult fare.

There is no legal maximum age limit for flying as a passenger on a commercial aircraft; as long as an individual is in stable health and fit for travel, they are permitted to fly regardless of being 80, 90, or even over 100 years old. However, while age isn't a barrier, health conditions often are. Airlines may request a "Fit to Fly" certificate or medical clearance for elderly passengers with significant heart, lung, or mobility issues, as the lower oxygen levels and pressure changes in the cabin can exacerbate pre-existing conditions. For the very young, most airlines have a minimum age limit, usually requiring infants to be at least 7 to 14 days old before they can board a flight, though some will allow travel as early as 48 hours with a doctor's note. In 2026, travelers over 70 should also pay close attention to travel insurance policies, as many standard providers have age caps or exclude certain medical conditions once a passenger reaches a certain milestone. For senior solo travelers, many airlines also offer "Meet and Assist" services to help navigate the complexities of modern terminals.