https://www.cdc.gov/mmwr/volumes/69/wr/mm6912e2.htm https://www.cdc.gov/mmwr/volumes/69/wr/mm6912e2.htm gives a CFR of 4.3–10.5% for age group 75-84 and 10.4–27

https://www.cdc.gov/mmwr/volumes/69/wr/mm6912e2.htm https://www.cdc.gov/mmwr/volumes/69/wr/mm6912e2.htm gives a CFR of 4.3–10.5% for age group 75-84 and 10.4–27.3% for age group ≥85. Your number is over that by quite a bit, where is it from?