Chickenpox vaccine is also necessary at age 11 in the absence of a previous chickenpox infection; however, it is generally not necessary if you have been previously infected with the chickenpox virus. Chickenpox vaccination is intended for people over 1 year of age who are susceptible to chickenpox infection. If you are currently 11 years old and have no history of chickenpox, timely vaccination against chickenpox is very necessary, and immunization can be obtained after vaccination. However, if you have ever been infected with chickenpox vaccine, you can choose not to be vaccinated when you are 11 years old, because the population is generally susceptible to varicella zoster virus, but you can obtain permanent immunity after your body has healed, so there is no need to be vaccinated against chickenpox in this case. Before receiving the varicella vaccine, it is important to understand your condition and consult your local doctor if you have any questions.