If mostly old people die from COVID but the adverse reaction of the vaccine is independent of age, then for very young people the risk of an adverse reaction of the vaccination might outweigh the risk of permanent damage from COVID.
But it doesn't mean that you will surely get COVID if you refuse to get a shot. Also, some people claim the vaccines are not very effective against some variants such as the South African one. So it means you can get vaccinated, suffer some serious side effects, and once you are recovered, get COVID.
And not just because of the obviously higher risk associated, but also because it appears not to be effective against the new strains. (Especially the new South Africa strain). Unlike for example the Janssen vaccine (goes by their parent company of Johnson and Johnson in the US) which was actually validated in South Africa or the rna ones which are just a technical masterpiece.
Keep in mind that the real shortage of vaccines is production locations right now. And the type of production of the Janssen, AZ and the Sputnik vaccine is all similar. So why even produce more of the worst vaccine in any of these locations.
Regarding the strains, all vaccines are less effective against the South African one.
Maybe they won't let you know, to avoid people refusing to get the AZ "vaccine".
How long until you can buy it? This way it's not a (possibly corrupt) politician deciding which corporation will make the stuff that gets into your body.