You can get asthma at any age. You cannot catch asthma from other people. Many times more than one person in the same family has asthma.
Airways carry air to the lungs.
Airways get smaller and smaller like branches of a tree. When asthma is under control, the sides of the airways in the lungs are always thick and swollen. An Asthma attack can happen easily . During an asthma attack, less air can get in and out of the lungs. People cough and wheeze.