20% of deaths are under 65. 8% are under 55. 2.5% under 45
data.cdc.gov
The data leans old, but not as old as you said. Wide open without controls would mean quite a few deaths among middle aged people, too.
Agree we need to open up, but that’s no reason to be stupid about how we do it. Many people still are not doing the basics: limit shopping to once per week, wear a mask when out, avoid gatherings with people outside your household. Take a look at a street image from Seoul. See all the masks? If you want to open the economy like they have, you may need to look like they do. Wear the stupid mask.
And some things can’t open. We’d be fools to re-open indoor restaurants. No masks for people eating, of course. They talk, one infected person breathes out the virus, and the HVAC recirculates the virus to everyone in the room.