Yes. The basline symptoms may improve for years on end but you are always at risk of a flare. For that reason, getting annual flu shots are critical.
Yes. Asthma is a lifelong illness that may get better or worse over time. It is controllable with medications.
Possible. Some people can out grow asthma and get flare ups only when they are sick, on the other hand there are others who continue to have asthma. But asthma can be well controlled with inhalers and people can lead a normal life carrying on all activities without symptoms.