Michael, I don’t think anyone is suggesting that they shouldn’t be allowed to choose to be vaccinated if they so wish, just like adults. Forcing teenagers to be vaccinated against their will is an entirely different thing. Just like it is with adults.
There is also the ethical issue. You are asking a group who may derive little benefit for themselves to be vaccinated for the benefit of others with a vaccine that may (I repeat, may) have unforseen adverse effects in the longer term.
First off, do no harm.