An adult bar/bat mitzvah is a bar or bat mitzvah of a person older than the customary age. Traditionally, a bar or bat mitzvah occurs at age 13 for boys and 12 for.
The Adult Bar/Bat Mitzvah. Although not associated with puberty, this rite represents a spiritual "coming of age" for adult Jews. By Ellen Jaffe-Gill.
There are no special requirements for an adult bar mitzvah. Each person is free to create a ceremony and celebration that is meaningful for him.
There are many reasons for people to have bar or bat mitzvahs as adults: Some didn't have a ceremony in adolescence because their families.