"Asthma isn't just a childhood disease. You may have had this lung disease — which causes symptoms such as wheezing, coughing, increased mucus production and difficulty breathing — since you were a child, or you may have developed it as an adult."
My asthma was diagnosed in my 30's. Though I can recall many times as a youngster having severe spells of coughing, that I know now were asthma attacks.
This is one of the best articles that I've read concerning adult asthma and all the rest that can go with it! So I hope you take the time to read this article and that it helps.