Your risk analysis and approach remind me of the approach used to justify internment camps during World War II. You are not the only one and that is what is sad.Actually we do. Other countries report the same thing regarding kids. In a variety of countries schools for instance are open as just one example.
It makes far more sense to "lock up your 19 and 13 yr old" to protect you than it does locking down or severely limiting other people and families who have little to no risk. Now if everything is opened up and you still prefer to let them go out, that is on you. Either way that is a far smarter strategy vs locking down/limiting the vast majority of the population that doesnt have any real risk.
It certainly is changing all the time. The numbers in terms of fatality rate gets better and better. So on that I agree. And we should open up more based on who we see is at risk, etc. Again this isn't just US numbers. We see the same risk patterns in all the other countries as well.
Again why? We know who is at risk and who isn't.