Bar and Bat Mitzvah to the event. However, this does not delay the onset of rights and responsibilities of being a Jewish adult which comes about strictly by virtue of age. The obligation to lay tefillin begins when a boy reaches bar mitzvah age. The common custom is for the bar mitzvah boy to begin putting on tefillin one to three months before his bar mitzvah. This way, by the time he is obligated in the commandment, he will already know how to fulfill it properly. The first mention of a party associated with a synagogue bar mitzvah was in the 13th century, so
Adult bar and bat mitzvah The adult bar/bat mitzvah, which can be held at any age, differs from the child's bar/bat mitzvah in that it is usually planned by the person themselves instead of their parents. Due to it taking place at an advanced stage of life, many relatives who are often present at a child's bar/bat mitzvah are deceased, and the person is often married and/or has children and sometimes grandchildren. Many men have second bar mitzvahs at the age of 83, representing 70 years since their first. There are many reasons adult Jews choose to have a Bar or Bat Mitzvah: Rabbi Albert