The old people just die faster.
Some of the recent deaths in China have been 20 and 30 something medical people who were in the ICU for a month before they died.
Speculation on my part: their chances of contracting a more virulent strain were increased by working in the hospital.
Not only that, but younger people tend to go into more crowds, they commute on mass transit more, go to work, meetings, travel on business when they have no choice...
Younger people are screwed.