Can you give links to the original sources please.
KQ captain of evacuation flight dies of COVID-19
General data suggest that people who dying of Covid-19 tend to be very seriously ill with life-threatening diseases before getting the virus.
"General data" ? There is plenty of hard information about the enhanced risk due to various factors, including age. I suggest you look it up. And, yes, there is a low but not negligible chance of a healthy 25 year-old dying of COVID-19.