I know I need to just educate myself properly on the subject, and I will. But I'm hoping someone can just answer this vague question in the meantime. I just found out my father has COPD. I don't know the stage, but maybe it's not so advanced--he seems comfortable when he's not sick. But he often gets pretty scary coughs--bronchitis, I was told. However, he can still exercise and be active like normal, most days. Also, when I suggested he sleep with oxygen (having read a tiny bit), he said that the doctor doesn't think that's necessary for now.
If he loses weight and we get rid of all the carpets, put in an air purifier, maybe have him spend part of the year elsewhere to avoid the pollen and the cold, etc., is it possible for him to live comfortably for many years to come? Like into his 80s or 90s even? He's 65 now. He was a smoker, but not that heavy, and he quit decades ago.