https://www.nwhn.org/how-does-covid-19-affect-different-age-groups/

https://www.clickondetroit.com/news/local/2020/03/31/tracking-michigan-covid-19-cases-by-age-range/?outputType=amp

You might find something in Harvard dataverse.

Datasets are added continuously.

https://dataverse.harvard.edu/dataverse/harvard?q=covid&types=dataverses%3Adatasets%3Afiles&sort=score&order=desc&page=1

Bita Jamshidi , Thank you very much for these data which are interesting. Nevertheless, by mortality rate by age, I meant (as shown in my web link) the chance of death if a random person of an age group in the country were to catch the disease , i.e. the ratio of the number of dead persons on the total infected persons.

In my opinion, one of the main causes of death in the population is the possibility of coinfections, recently it has begun to be described, however, the number of screenings in the different institutions to identify other microorganisms is very low.

We share the following manuscript that identifies some of the microorganisms that cause coinfection with COVID-19

Article Are we now observing an increasing number of coinfections be...

Table 2 in this reference provided mortality rate by age (at a Time period before vaccination)

https://www.imperial.ac.uk/mrc-global-infectious-disease-analysis/covid-19/report-34-ifr/