I think we eat better than most Chinese folks. We are certainly wealthier.
I think the problem is that the gov is doing nothing here, and the young think they're invincible, whereas the Chinese didn't have that superior feeling - they didn't know one way or the other when it started.
Also, as
@10ofRods mentioned, we may have more young and female smokers here perhaps, but since the Chinese have far worse air, I'm not sure that's such a factor with this virus.
The Chinese also have thousands of years of Chinese medicine which may have helped many - to an unknown degree.
If I had to vote on it I'd say it's lack of government response combined with non-attentiveness of the young in the US that's the issue, sadly.