A single metric (e.g. positive tests) is not enough to assess any severity here, and even those metrics come with caveats because all of our methods of determining them are imprecise.
https://www.economist.com/graphic-detail/covid-pandemic-mort...
But in Germany and Europe children can't get vaccinated and by the time young adults can it will be September anyway.
> Moreover, the database is not a representative sample of the sars-cov-2-positive population. Because it only contains records from people who have interacted with a medical service provider, it excludes those who weather the disease at home without medical assistance.
This will exclude the vast majority of people in younger age groups who were affected. Serology studies have shown us that in many densely populated places infection rates have been far into the double-digit percentages - if this statistic was true in the way you interpreted it, we would know that by now.