All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
This practice is taken from some non-Muslim societies; for example, in Japan they celebrate this. Also, in Korea, they celebrate a girl's reaching the age of 20 years old.
Therefore, it appears that it is forbidden to arrange this celebration as it is imitating the non-Muslims, a matter which is Islamically forbidden.
Ibn ‘Umar narrated that the Prophet said: “Whoever imitates a people is one of them.” [Ahmad]
Allaah Knows best.