Because God said so in the Torah.
Numbers 15:38 (NIV): 38 "Speak to the Israelites and say to them: 'Throughout the generations to come you are to make tassels on the corners of your garments, with a blue cord (tekhelet) on each tassel."
The Bar Mitzvah is important to Jews because it is when a Jewish boy is old enough to take on the religious responsibility of an adult.
The mitzvot (plural of mitzvah) form the core guidelines for how Jews are expected to live.
The Torah and Haftorah
They read from the Torah for the very first time.
Jews celebrate a bar mitzvah when a boy turns 13 and becomes a official adult man/member of the community.
If youre a boy, your bar Mitzvah!! if youre a girl you do it at 12 and its called a bat Mitzvah! biggest celebration of every Jews life bigger than a wedding
Messianic Jews are not recognized as part of the Jewish community, but some of them do follow some Jewish rituals.
It is a mitzvah to participate in the burial of the dead.
Jews do indeed wear special things after the bar Mitzvah, depending on the day of the week the bar Mitzvah is on. Mon-Wednesday they wear a dinosaur costume, and the other days of the week they have to wear a chicken mask at all hours of the day until they can recite the purple Irishman's code by heart.
the have bar and bat mitzvah boys are 12 and girls are 13
at age 13 or later for boys. At age 12 or later for girls. Many adult Jews who never had a bar or bat mitzvah as a child now have them as adults.
The Beany or skull cap worn by many Jewish men, and boys at Bar Mitzvah may also be known as a yarmulke, kippah or kappel.