The Human Mortality Database, jointly run by UC-Berkeley and the Max Planck Institute for Demographic Research in Germany, is publishing weekly mortality rates by age group for the US and most European countries, dating back to 2000.

Here is Swedish data on school-aged children.

"Yeah, Matt, but what about the teachers?"

Well, if the teachers in Sweden were also age 15+ in 2015-16 (and they were), then they can take heart! They've lived through a higher-risk environment than the COVID-19 pandemic. This age group covers all working-age adults.

So, where is the excess mortality coming from?

Well, of course, from the age 85+ demographic, where 40% of Sweden's deaths reside. Note that even here, there is higher mortality as recently as January 2000 - but, this was before substantial medical advancements. Here's the risk.

All data from https://www.mortality.org/ 

They have data by week, stratified in these age groups, for more than 25 countries (most European countries, plus the US). If you have a request for similar charts in a country, let me know and I should be able to put together.