Hello and thank you for your question,
There is no ability to predict the life expectancy for COPD diagnosis because there are a lot of factors that it depends on.
Life expectancy depends on the severity of COPD at the time of diagnosis, need for oxygen, is the person still smoking or is exposed to 2nd hand smoking.
People with COPD can live perfectly normal lives (with using inhalers) as long as they quit smoking.
I have a patient who died at the age of 91 (from lung cancer) who had severe COPD and was on oxygen plus all the inhalers since he was 70.
So there are a lot of factors that go into prognosis for COPD but most peoples' life expectancies will not be compromised from COPD diagnosis.
I hope you find this information helpful. Please feel free to follow-up with any other questions you might have.
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Best wishes and good luck,