I've had a go at trying to estimate the blood clot cases by age compared to vaccine doses by age.
It cant be accurate because the vaccine data 1. doesn't specify what vaccine was given, and 2. We cant be sure about matching dates of vaccine to dates of the reported cases.
With those 2 big caveats:
NHS England has published data on total vaccines by 5 year age groups, up to April 7th, by which time there had been 26.8m first doses. (www.england.nhs.uk/statistics/statistical-work-areas/covid-19-vaccinations/)
The MHRA data on blood clots etc goes to April 21st. But seeing as there is a delay between reactions and receipt of vaccine, perhaps that doesnt create a huge problem for comparing the 2 sets of data. We cant know (very annoying that obvs the MHRA can know, and yet have chosen not to tell us).
Biggest problem with the data is the vaccine data doesnt split by vaccine type. However the MHRA say that by April 21, 66% of all first jabs were AZ. However, that 66% might not be evenly spread between the age groups. We know that Pfizer was generally used for the older group, so it may be that the % of AZ vaccine used in the younger groups was greater than 66%.
Using the NHS England data on vaccines by age group and comparing it to the MHRA table on clots by age (incidentally, that table is only in the web version, not the PDF), gets the following blood clot incident rates, expressed as the number of jabs per clotting incident. I'm showing a range. The lower jabs per incident figure is if we assume only 66% of all vaccines given to that age group up to April 7th were AZ, and the higher figure is if we assume 100% were. The real figure will be somewhere in between, but I dont know where (and it will be at a different point for each age group - I suspect it will be towards the higher end of the stated range for the younger group and the lower end for the older group).
Under 50: one incident per 56, 590 to 85,740 jabs
50-59: one incident per 76,900 to 116,500 jabs
60-69: one incident per 120,270 to 182,230 jabs
70-79: one incident per 154,300 to 233,800 jabs
80+: one incident per 297,040 to 450,070 jabs
I cant look at sub groups under 50 as the data on jabs lumps all under 50s into one single group.