Speaking as the person you thought you were replying to: "younger" as in "than 85+", the context of the thread. "20 years old" is something you made up to make your argument look more sound than it is.
The 20-ish demographic is actually the worst case with respect to asthma, representing a larger than average proportion of asthma-positive COVID hospitalizations because they don't really have many other co-morbidities and they're young. It's all in the link I provided. 20-ish is actually to your advantage, not mine. I'm not trying to "win" anything, just provide some perspective.