First, there are many elderly people suffering from hypertension, hyperlipidemia, diabetes and cardiovascular and cerebrovascular diseases.
Most elderly people have some basic diseases, such as hypertension, hyperlipidemia, diabetes, cardiovascular and cerebrovascular diseases and so on. So once infected with COVID-19, it is likely to induce the occurrence of other diseases, which will be quite troublesome to treat. Young people do not have these basic diseases, so there are fewer severe cases after COVID-19 infection. Because of the basic diseases, it is very likely that the elderly will develop into severe patients after being infected with COVID-19.
Second, the elderly have poor physique and low immunity.
The elderly generally have low physical fitness and low immunity. Mainly because their functions in all aspects of the body are declining. Even some body functions are on the verge of failure. This is also the reason why the elderly are prone to serious illness after infection. Their physical condition is like a candle in the wind. How can they resist the invasion of the virus?
Third, the number of elderly people vaccinated with COVID-19 vaccine is very small.
According to statistics, the vast majority of people in China have been vaccinated with COVID-19 vaccine, together with infants over three years old who attend kindergarten. The main purpose of doing this is to make the body have a memory of this virus, and when this virus invades, it can play a good role in resistance. However, a large number of elderly people are not vaccinated because of poor quality or basic diseases. This is also one of the reasons why the elderly are easy to develop into severe diseases after being infected with COVID-19.