Does the chicken pox vaccine confer lifelong immunity?

Not known yet: Chicken pox vaccine has been introduced for about 17 years. We have to wait and see.

Possibly: Introduced in the late 70's in japan, the current CP vaccine was not adopted in the us until the 90's. There are good data that one dose removes the risk of death with cp, but likely only 85% get protective immunity from 1 dose, with that improving to >95% after 2 doses given at least a month apart. Time will tell if future boosters are needed but with 30+ years of worldwide data it looks good.