Five Towns JewishTimes by Rabbi Yair Hoffman
The Sefer HaChinuch explains that these seven laws are, in fact,
categories of laws. These categories are the injunctions against murder,
stealing, worshiping false gods, engaging in forbidden liaisons, eating
the flesh of a live animal, and cursing Hashem, as well as the
responsibility of setting up a system of justice whereby these laws are
enforced.
Why then don’t they have bar mitzvah and bas mitzvah ceremonies?
Not a bad question, in fact. Jewish boys and girls have bar and bas
mitzvahs when they reach the age at which they are obligated in
observing the 613 mitzvos. What about their non-Jewish contemporaries,
Chris and Kathy, for example? Perhaps the most pressing question is,
when exactly is a gentile obligated in his or her mitzvos? And, more to
our point, can the rabbi theoretically sell the community chametz to a
mature eleven-year-old gentile?
It seems that there are three opinions among the Acharonim as to when
our theoretical gentile would celebrate this milestone. The Chelkas Yoav
(Vol. 1, s.v. “Aval”) indicates that the designated age would be the
same as the age at which a Jewish child becomes a bar mitzvah. Thus,
according to the Chelkas Yoav, “Chris” would celebrate his bar mitzvah
at thirteen, while “Kathy” would celebrate hers at twelve. [...]
This brings us, however, to another question. Where did the age of
thirteen come from in the first place? Also, is this figure a d’Oraisah
(Biblical) ruling or is it a rabbinic ruling? If it is rabbinic in
nature, then would it also apply to gentiles? (Gentiles, we recall,
generally do not have to follow rabbinic laws.) [...]