title: Age of onset of asthma.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001249:Asthma / Q000175:diagnosis / Q000453:epidemiology*; D002648:Child; D002675:Child, Preschool; D006801:Humans; D008875:Middle Aged; D011379:Prognosis