The younger age groups say below 60 or 70 are big spreaders though, which you have not admitted. Many of them go everywhere, mix with other people in bars, restaurants, gyms, stores, share meals, and social gatherings everywhere. Many do not physically distance or follow the health guidelines. This is especially so in the U.S. where there are huge numbers of new cases every day and many deaths. They have a lower death rate than older people but they spread it to older people in their families and relatives, who then get serious illness and some die. So just saying it is mainly the 70+ who die is true but it leaves out the other half of the story.