Our results suggest a very low fatality ratio in those under the age of 20 years.
In spain a young football trainer (39) died of corona. But the autopsy did show that he had an undetected leukemia! Most younger that die have also at least one precondition where smoking and speed (+ asthma) are the most frequent ones...
Further, as mentioned weeks ago. The first dose is crucial for the outcome. For aids e.g. one must assume that a single first virus can be deadly in other cases you need dozens or some thousands in one batch!
Two persons died of bird flue. One did run an infection of a chicken farm without mask... So he may be got millions of virus within one hour.