The age limit for the booster is 18 years of age or younger. After the vaccine is administered for the first time, the antibody levels in the body of the vaccinated person will continue to decline over time, and when the level of decline reaches a certain level, it is necessary to receive a booster shot of the New Crown Vaccine in order to maintain the antibody levels and strengthen the resistance to the disease. Scientific research data has shown that the booster shot of the New Crown vaccine to strengthen the immunization has a relative effect on the prevention of infection and re-transmission of the vaccine, and also has a significant effect on the prevention of pneumonia and the onset of severe pneumonia, and at present the booster shot of the New Crown vaccine is mainly targeted at the age of 18 years and above. For specific vaccination precautions, consult a medical professional.