Coming of age is a young person's transition from being a child to being an adult. The certain age at which this transition takes place changes in society, as does the nature of the change. It can be a simple legal convention or can be part of a ritual or spiritual event, as practiced by many societies. In the past, and in some societies today, such a change is associated with the age of sexual maturity (early adolescence), especially menarche and spermarche. In others, it is associated with an age of religious responsibility. Particularly in western societies, modern legal conventions which stipulate points in late adolescence or early adulthood (most commonly 18-21 when adolescents are generally no longer considered minors and are granted the full rights and responsibilities of an adult) are the focus of the transition. In either case, many cultures retain ceremonies to confirm the coming of age, and significant benefits come with the change.
Coming of age is often a topic of fiction, in the form of a coming-of-age story. In written literature, a novel which deals with the psychological and moral growth often associated with coming of age is sometimes called a bildungsroman. Similar stories that are told in film are called coming-of-age films.
Turning 15, the "age of maturity," as the Baha'i faith terms it, is a time when a child is considered spiritually mature. Declared Baha'is that have reached the age of maturity are expected to begin observing certain Baha'i laws, such as obligatory prayer and fasting.
Theravada boys, typically just under the age of 20 years, undergo a Shinbyu ceremony, where they are initiated into the Temple as Novice Monks (Samanera). They will typically stay in the monastery for between 3 days and 3 years, most commonly for one 3-month "rainy season retreat" (vassa), held annually from late July to early October. During this period the boys experience the rigors of an orthodox Buddhist monastic lifestyle – a lifestyle that involves celibacy, formal voluntary poverty, absolute nonviolence, and daily fasting between noon and the following day's sunrise.