Denmark has recommended the use of COVID-19 vaccines for people only over 50 years of age, explaining that the decision is because widespread immunity and low risk from Covid mean the benefits from vaccination are too low.
People aged under 50 are generally not at particularly higher risk of becoming severely ill from COVID-19. In addition, younger people aged under 50 are well protected against becoming severely ill from COVID-19, as a very large number of them have already been vaccinated and have previously been infected with COVID-19, and there is consequently good immunity among this part of the population.
As a study (under peer review) has shown, the risk of serious adverse effects from the COVID-19 vaccines is higher than its benefits for younger people. This is of course the most probable reason Denmark has banned them.
The study, whose authors include Dr. Kevin Bardosh, a recipient of funding from the pro-vaccination Wellcome Trust led by Sir Jeremy Farrar, and Dr. Tracy Beth Høeg of the Florida Department of Health, presents a risk-benefit assessment of booster vaccines among people of student age and provides five ethical arguments against mandates.