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Biologically, an adult is a human or other organism that has reached sexual maturity.
Most modern societies determine legal adulthood based on reaching a legally specified age without requiring a demonstration of physical maturity or preparation for adulthood.
Sometimes there is no requirement, but rather a recommendation.
Using the example of pornography, one can distinguish between: The age of majority ranges internationally from ages 15 to 21, with 18 being the most common age.
Niger, Mali, Democratic Republic of Congo and Cameroon define adulthood at age 15, but marriage of girls at an earlier age is common.
In most of the world, including most of the United States, parts of the United Kingdom (England, Northern Ireland, Wales), India and China, the legal adult age is 18 (historically 21) for most purposes, with some notable exceptions: According to Jewish tradition, adulthood is reached at age 13 (the minimal age of the Bar Mitzvah or Bat Mitzvah) for Jewish boys and girls; they are expected to demonstrate preparation for adulthood by learning the Torah and other Jewish practices.Conversely, one may legally be an adult but possess none of the maturity and responsibility that may define an adult character.