The age at which a boy is typically referred to as a "man" and a girl as a "woman" can vary depending on cultural and societal norms. There is no universally fixed age for this transition, and it often differs from one culture to another.
In many Western cultures, the terms "boy" and "girl" are typically used for individuals under the age of 18, and "man" and "woman" are used for those who are 18 years old and above. This is due to the legal age of adulthood being set at 18 in many countries.
However, it's essential to note that the transition from being considered a "boy" or "girl" to a "man" or "woman" is not solely based on reaching a certain age. In various societies, there might be other factors involved, such as maturity, social responsibilities, rites of passage, or cultural traditions.
Overall, it's best to consider the context and cultural norms of the specific community or region in question when determining at what age someone is considered a "man" or a "woman."