The normal vaccination program for chickenpox vaccine is 12~18 months for the first injection, and 4~6 years old for the second injection, which is the best time for vaccination. However, there is no age limit for varicella vaccine, and both children and adults can be vaccinated.
Varicella vaccine can effectively prevent varicella-herpes zoster virus infection, the infectious force is stronger in early childhood, so in the normal vaccination program can achieve better preventive effect. However, there is no age and time indication for varicella vaccination, children and uninfected adults can be vaccinated, with a minimum interval of 3 months between the first and the second vaccination, and the vaccination can be completed within 3~4 years.
In conclusion, there is no clear age limit for varicella vaccination, and it can be administered if there are no contraindications.