the age of its population, since the virus has no specific treatment.
28.6% of the Italian population is 60 years old or older (second in the world after Japan at 33%).
South Korea, only 18.5% of the population is at least 60 years old.
The impact of this disparity is quickly shown in the analysis of coronavirus deaths in each county. In Italy, 90% of the more than 1,000 deaths occur in those 70 or older.
By contrast, the outbreak in South Korea has occurred among much younger people. There, only 20% of cases have been diagnosed in those 60 years old and up. The largest affected group is those in their 20s, who account for almost 30% of all cases.
https://www.cnn.com/2020/03/16/opinions/south-korea-italy-coronavirus-survivability-sepkowitz/index.html