Data from case series of #coronavirus so far consistently show that age distribution of more severe disease skews younger than influenza with clustering around the 20-40 age cohort. Charts by @AEI based on these #COVID19 reports medrxiv.org/content/10.110… and thelancet.com/journals/lance… 
In one series, of 4,021 laboratory confirmed patients (mild, moderate, severe) in China, the mean (±standard deviation) age among confirmed patients was 49±16 years. Fourteen children <10 years old were confirmed to be infected with 2019-nCoV, only 0.3% medrxiv.org/content/10.110…
Some evidence #COVID19 causes aberrant host immune responses that are associated with severe lung pathology and ARDS type outcome that’s also correlated with a cytokine release. It could be younger patients are more likely to mount vigorous immune response thelancet.com/journals/lance…
