The injection regulations for our New Crown vaccine state that elderly people over 60 years old can receive the New Crown vaccine. If 90-year-olds are in good health, there are no contraindications, and chronic diseases such as hypertension and diabetes can be effectively controlled, they can get the New Crown vaccine. The safety of the New Coronavirus vaccine is guaranteed, and the New Coronavirus vaccination can reduce the efficiency of transmission of New Coronavirus pneumonia and is one of the main measures to prevent New Coronavirus infection in 90-year-olds. However, it should also be noted that vaccination with the New Coronavirus vaccine is not recommended in cases of allergy to the vaccine components, periods of disease onset, or fever. In particular, 90-year-olds have poorer physical functions, and adverse reactions may be aggravated after the New Coronavirus vaccination. The elderly should be aware of any adverse reactions during the injection and should stay for 30 minutes after the injection before leaving. Adverse reactions such as redness, swelling, pain and generalized fever at the injection site may occur after vaccination, which are normal reactions after vaccination. In case of serious adverse reactions such as high fever and severe pain, you should go to the hospital for relevant examination and appropriate treatment in time.