There doesnt seem to be anything significantly intriguing of therapeutic value derived from studying the rate differences other than the obvious. That is several essential to health recovery components highly correlated to old age in eg immune system, lung function, diabetes, obesity, asthma, co morbidity, cancer, past lifestyle choices, overall quality of recovery from adversity etc all deteriorate exponentially and cumulatively enhance probability of failure a couple of orders of magnitude. I would add that people living in care facilities get exposed to greater viral loads as secondary targets of the virus than the first person that opportunistically gets it in that system. The first has a smaller viral attack initially than the ones that are already there living exposed to the release of viral particles of the earlier targets. So if older people tend to live more together with others than younger people the chances of secondary exposure is higher too leading to worse than the original attack. You get clusters of substantial failure.
Worth going over all this next even if dated still relevant
https://news.cornell.edu/stories/202...-deadly-others
"Age is one risk factor. Compared to younger patients, middle-aged and older ones are far more likely to suffer symptoms, to be hospitalized and to die. One recent analysis of Chinese data estimated the chance of death in confirmed COVID-19 cases at more than 13% for patients 80 and older, compared to about 0.15% for patients in their 30s, and virtually 0% for patients under 20. A study of early U.S. cases by the Centers for Disease Control and Prevention (CDC) had similar findings."
"Catching a low dose from someone who was mildly symptomatic on the subway may involve a lower risk of severe illness,” Pelzman said, “compared to catching a high dose from a very sick and highly contagious patient.”