The above is ~1/100,000. IFR (which is compatible with what I said) for 19 and younger is 3/100,000, but that includes younger people that are even less impacted.

So it is sort of the same ballpark for the very youngest adults, but a factor of 3 isn't nothing. It's higher for people in their 20s already. We can be talking about different things though, as it isn't 100% likely a given person will be infected.