This cohort is largely unaffected by covid19. Not to mention, "up to 90 per cent of 17-year-olds already have Covid antibodies."
https://www.the-sun.com/health/3451600/teen-boys-heart-compilations-pfizer-vaccine/
Let us not forget, in the UK, the vaccine advisor board concluded that vaccines were not recommended for younger people.
https://www.bbc.co.uk/newsround/58439829
Although this appears to have already been reversed or ignored. The insistence on vaccinating younger people goes against all commonsense and science.