The theory that the old are worst impacted by SARS-Cov-2 because they haven’t had a lifetime of…

The theory that the old are worst impacted by SARS-Cov-2 because they haven’t had a lifetime of immunity-building infections. Or maybe the immune systems of the old are weaker, and succumb more easily to lethal viruses? https://t.co/uMU4Zvtc8M