Data from 6-month UK study of 51,281 people who died as a result of COVID -- 43.4% had no underlying health conditions. https://www.ons.gov.uk/peoplepopulationandcommunity/birthsdeathsandmarriages/deaths/articles/deathsinvolvingcovid19byvaccinationstatusengland/deathsoccurringbetween2januaryand2july2021
Data from 6-month UK study of 51,281 people who died as a result of COVID -- 43.4% had no underlying health conditions. https://www.ons.gov.uk/peoplepopulationandcommunity/birthsdeathsandmarriages/deaths/articles/deathsinvolvingcovid19byvaccinationstatusengland/deathsoccurringbetween2januaryand2july2021
Deaths "involving" Covid is rather elastic a starting place. Also, the median age of death for breakthrough deaths was 84 and for everyone else 82.