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.
Physical Development. Teenagers can grow 3.5 to 4.1 inches during a one-year growth spurt, and 50 percent of their adult weight and bone mass develops during teenage years. With this increase in height, boys gain weight because of increased muscle development and girls due to body fat needed for developing reproductive processes.