Vaccination also prevents catching it, which prevents dying from it, which this age group is much at risk at even without prior complications.
There is a heck of a lot more people who are at risk of being superspreaders, not even mentioning the huge number of middle aged people going to protests against a diseases existence. You won't get those people vaccinated. They will massively contribute to the spread.
Additionally, vaccinating risk groups in the high age category first lets you spot complications with the disease more early and it's ethically somewhat better to risk long-term vaccination issues with 90+ year olds than 20+ year olds, as one of these groups will have to suffer the consequences for a shorter time. It may sound harsh to make comparisons like that but you'll have to make decisions like that in a medical environment.
There is a heck of a lot more people who are at risk of being superspreaders, not even mentioning the huge number of middle aged people going to protests against a diseases existence. You won't get those people vaccinated. They will massively contribute to the spread.
Additionally, vaccinating risk groups in the high age category first lets you spot complications with the disease more early and it's ethically somewhat better to risk long-term vaccination issues with 90+ year olds than 20+ year olds, as one of these groups will have to suffer the consequences for a shorter time. It may sound harsh to make comparisons like that but you'll have to make decisions like that in a medical environment.