How long does someone with COPD usually live?

Depends. Depends on the severity of COPD and even then, each individual is different...So difficult to predict.
Varies... COPD is a slowly progressive disease but many factors determine the rate of progression. If you continue to smoke, for example, it will progress faster than if you quit. There are likely genetic factors that come into play as well. Ask your doctor about pulmonary rehab since patients who stay active seem to fare better. Treat exacerbations early to avoid further lung inflammation.