My asthma symptoms mostly abated after adolescence -- I think change in lifestyle (going away for college, becoming more active, better stress management, etc) helped me to manage most of my triggers. As an adult I've only done them "as needed," which in my case has been due to a flare-up which lands me in the doctor's office, which is usually a new doctor because I move so much. On average it's only been every few years or so.