I'm guessing it comes down to many factors, including a person's general fitness/wellness, their lifestyle (Ie are they still smoking? Do they exercise? Nutritious diet? Positive outlook on life?) along with other things like how much oxygen they are on, what their usual blood saturation levels are like etc.
My nanna died from old-age related organ-failure, but had emphysema & heart problems for some time before that. To start with she was still fairly active and got about with a little oxygen. I used to take her shopping and out to the movies and stuff, but she needed a little extra help at home. Over time ( a couple of years) her condition worsened, she was able to walk less and less in one sitting, and the amount of oxygen (in Litres/minute) was increased repeatedly. Towards the end she was virtually bed-bound, and prone to repeated doses of pneumonia. It was fairly apparent how much her health had declined over that time.
But I would expect a younger person who is proactive about their health would live a lot longer than that.
Hope that helps. Have you talked to your step mum or dad directly about it? Do they have a respiratory nurse or a social worker or someone helping them that you could talk to, to get an understanding of the issues they are facing? Because that's what you really need to know isn't it, how they will manage in their current and future situation?


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