90-year-old people who are in good health can take the new crown vaccine, and because the immune function of the elderly is relatively weak, once infected with the new crown virus, the proportion of serious and critical illnesses is higher, so it is more recommended to take the new crown vaccine for elderly people who are in good health and have no contraindications. Elderly people aged 90 should be actively vaccinated with the New Crown vaccine if they are in good health, do not have acute infectious diseases such as fever, are not in the acute exacerbation of chronic diseases such as acute exacerbation of chronic obstructive pulmonary disease, acute exacerbation of asthma, etc., and do not have uncontrolled serious chronic diseases such as serious cardiovascular diseases, liver and kidney diseases. Moreover, elderly people who are not allergic to a component of the New Crown vaccine, have no history of vaccine allergy, do not suffer from epilepsy, serious mental system diseases, do not have platelet dysfunction or bleeding disorders, do not have serious immunodeficiency diseases, and are not in the stage of receiving immunosuppressive treatment, can be vaccinated with the New Crown vaccine. After vaccination, one should stay at the site for 30 minutes and take care to keep the vaccination site clean and dry, and consult a doctor if there is any discomfort.