Please be crisp on this. That is one hypothesis, but do we have the data yet to make sure it is the answer? I'm doubtful. Could also be unknown recall rates on the test. Could be plenty of things.
So, for example, I have a hypothesis that this is mainly baseline lung damage causing severe cases. That said, I cannot claim that is what it is.
I'm sure I have been sloppy and pushed this idea some without being clear it is just a hypothesis of mine. That said, I try and be clear with that message.
The part of Italy hit also has air quality, per aqi searches, that is comparable to the region in China that was hit hard.
Have people looked that it is not age, but baseline damage to your lungs that is the main factor in serious cases? Older people will have more exposure to local air pollution, just from having lived longer. That existing damage can be what contributes to complications, right?