Sine the immune system declines with advancing age, therefore older people are more susceptible to coronavirus (COVID-19) infection. As we age, the thymus and bone marrow produce less of the vital B and T cells, which are key players in the immune system.

I think is due to low immunity in adults that why is so dangerous for them

This gonna big reward for all upvoters

How doctors can significantly reduce the number of deaths from Covid-19 ???...