Asthma can start at any age, although about half of all people with asthma have had their first symptoms by the age of 10 and many children with asthma have ad their first asthma attack before the age of 6.
Asthma is difficult to diagnose in children under the age of 2. This is because wheezing and respiratory infections are common in young children and the symptoms similar to asthma. If your child is under 2 years of age and their symptoms are bad or don’t go away your doctor may decide to give them a trial of asthma medication to help make a diagnosis. In many cases a diagnosis of asthma may not be confirmed until a child is over the age of 5.