Yes, children of any age can earn Delta SkyMiles. Delta does not have a minimum age requirement for joining the SkyMiles program, meaning even "lap infants" (children under two) can theoretically have an account, though they only earn miles on tickets where a fare is paid. For children under the age of 13, a parent or legal guardian must complete the enrollment process on the Delta website. Once enrolled, the child earns miles based on the ticket price and their flight distance, just like an adult. These miles never expire, which is a significant advantage for young travelers who may only fly once or twice a year. Furthermore, having a SkyMiles account allows children to access free in-flight Wi-Fi on Delta Sync-equipped aircraft. Setting up an account early is a popular strategy for families to pool resources or save up for a "graduation trip" or future family vacations using the child's accumulated balance.