Check-in for air travel differs depending on your starting destination, your final destination, the airline you are flying and your travel day and time.
Boys continue growing until age 17 or 18. Boys and girls grow about two inches per year until they reach puberty. Then they each have a growth spurt that lasts a year or two. During the growth spurts, boys grow a little faster than girls. Girls reach puberty (on average) about a year before boys do. Girls also end puberty earlier than boys.
Girls start puberty sooner and faster than boys do. Girls usually begin to grow taller 2 years younger than boys do. But because boys have more years to grow and a bigger growth spurt, they usually end up taller than girls.