I'm searching for data sets about Covid-19 patients, where the column "age" occurs for each patient. All the sets I find are summarized, like the one from the John Hopkins University.
The UK Biobank (cohort study of 500,000 participants) incorporates SARS-CoV-2 test result data. It contains age, as well as entire medical history information for each participant.
* Disclaimer: I have worked on this project.