Is it possible to grow out asthma?

Yes for children: Children that are likely to "outgrow" asthma typically do not have allergies, eczema, food allergies, parents with asthma or elevated eosinophils on their blood count (cbc). This is called the modified asthma predictive index. These kids typically have wheezing only with colds. Usually boys outgrow asthma more often than girls.

Define asthma: Most wheezing in early childhood is related to infections but often treated the same as asthma. A good 2/3rds of these will grow out of this wheezing tendency by school age. I do not call this asthma. For those with genetically linked asthma, some of the worst will be symptomatic in childhood, but it may emerge when older. True asthma is always there but you can symptom free for extended periods.