COPD- Chronic obstructive pulmonary disease
CHRONIC- being the main word(persistent and lasting disease)
COPD is uncommon to people under the age of 40 and then is progressive
Asthma: Chronic Inflammation disease, the airways contsrict. These disease can be managed and a child can grow out of this. Both of these can an undertermined amount of time in a person.
I hope that helps you.
Take care and God bless.