Can’t make an assessment without all the numbers but they might be triaging the younger patients to the ICU beds (better chance of survival). Rumor is that this is the practice in Italy.
It took nearly a century for the best minds to come to conclusions about the 1918-1929 Spanish Flu. And the numbers of deaths and the fatality rate still vary pretty widely.
About Coronavirus, we do the best with the information we can glean in real time.
Watch this.
Dr. John Campbell: Sunday 15th March, Covid-19 International aspects
https://www.youtube.com/watch?v=GIMXekRVnHo