Asthma is often misdiagnosed in older adults because of the common belief that it is just a childhood disease. But according to the American Lung Association, experts now think about 10 percent of the people with asthma are over age 65. Some adults with asthma have dealt with the disease all their lives. Others may have had asthma as a child and experienced it again after many symptom-free years. But if you’ve developed breathing problems as an adult, you have lots of company. Lateonset asthma is becoming more common and …