all the evidence points to an extremely strong age dependency on both infection likelihood, and most importantly on the severity of cases.
Nothing is ever 100% but if the rest of the population had the same characteristics as the youth there would be no reason for a lockdown to begin with. We are talking about death rates of 1 in 100K cases.
For young people the flu is far more dangerous than COVID-19. Of course for alarmists this is heresy that should be never talked about.