Middle-aged and elderly people don't wear masks when buying food. Is it reasonable for the supermarket to persuade?

I think it is reasonable for middle-aged and elderly people to buy food without wearing masks, and it is also reasonable for supermarkets to discourage them. At present, the situation of pneumonia caused by COVID-19 is still tense and grim. It broke out in a place in Wuhan and then spread to the whole country. This speed of transmission is amazing. Experts' research shows that COVID-19 is highly contagious, and droplet transmission is the main way, so personal protection is very important. Regarding personal protection, wearing a mask is the most basic and effective means of protection. So now many places stipulate that if you enter some shopping malls or supermarkets, you must wear masks. For some middle-aged and elderly people who don't wear masks to buy food, supermarkets have the right to discourage them, because this is a safe and responsible move for everyone and should be supported. The epidemic has a great impact on middle-aged and elderly people. According to relevant data, among these people who died of serious illness, the elderly over 60 accounted for the majority. Therefore, as middle-aged and elderly people, we should protect ourselves. Because middle-aged and elderly people have weak resistance and suffer from other basic diseases, it is very harmful to immunity to be infected with this new type of pneumonia. It will cause such and such problems, which are very difficult and troublesome. Therefore, middle-aged and elderly people generally stay at home. Unless they have to go out, they must wear masks when they go out. Therefore, this norm and behavior of supermarkets is commendable. Not only are middle-aged and elderly people not allowed to enter without masks, but all customers should also be advised not to wear masks. Now is the epidemic period, everyone is in a war without smoke, and everyone should make unremitting efforts to win this tough battle. As the smallest unit and individual, it is the greatest contribution to the society and the movement to do their own protection, go out less and visit less.