Analysis of information sources in references of the Wikipedia article "Bar and bat mitzvah" in English language version.
...the rabbinate in the United States had already decided on the halakhic impropriety of the Bat Mitzvah ritual...
...Orthodox leaders resisted the "innovation" and impulse to be "with it." In fact, as late as the 1970s, only the most accommodating Orthodox rabbis permitted bat mitzvah ceremonies, and they allowed just the most modest sort of occasions...
Today in almost all non-Orthodox congregations, all children mark symbolic entry into Jewish adulthood through b'nai mitzvah (bar or bat mitzvah) at age 13.