Islam
Reaching maturity (bulugh)
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happens
There is no religious ceremony. At puberty a young person becomes responsible for prayer, fasting and the other duties. Many families celebrate a child's first complete reading of the Qur'an (khatm or ameen) with a gathering.
why
Responsibility comes with maturity and understanding, not with a ritual.
origins
The duties of maturity come from the Qur'an and hadith; the Qur'an-completion party is a cultural custom, common in South Asia, Africa and Southeast Asia.