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.
From the age of 2 until you reach puberty, you grow at a rate of about 2.5 inches per year, and boys and girls share similar physical characteristics. But at around age 11 for girls and age 13 for boys, you undergo a pubertal growth spurt that lasts for about two years.